Twitter bootstrap – rake aborted! cannot load such file — mysql2/mysql2 on El Capitan

I have been trying from last 2 weeks to setup my code on Mac. Previously I was using Ubuntu, it was never this difficult to setup code. I have followed almost all tutorials but no luck. Please can anyone guide me on setting up RoR on mac. After following all the tutorials I end up at mysql error only.

rake aborted!
cannot load such file -- mysql2/mysql2
/Users/sahil/Documents/work/ccprod/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:251:in `require'
/Users/sahil/Documents/work/ccprod/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:251:in `block in require'
/Users/sahil/Documents/work/ccprod/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:236:in `load_dependency'
/Users/sahil/Documents/work/ccprod/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:251:in `require'
/Users/sahil/Documents/work/ccprod/vendor/bundle/ruby/1.9.1/gems/mysql2-0.3.14/lib/mysql2.rb:8:in `<top (required)>'
/Users/sahil/.rvm/gems/ruby-1.9.3-p551@global/gems/bundler-1.10.6/lib/bundler/runtime.rb:76:in `require'
/Users/sahil/.rvm/gems/ruby-1.9.3-p551@global/gems/bundler-1.10.6/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
/Users/sahil/.rvm/gems/ruby-1.9.3-p551@global/gems/bundler-1.10.6/lib/bundler/runtime.rb:72:in `each'
/Users/sahil/.rvm/gems/ruby-1.9.3-p551@global/gems/bundler-1.10.6/lib/bundler/runtime.rb:72:in `block in require'
/Users/sahil/.rvm/gems/ruby-1.9.3-p551@global/gems/bundler-1.10.6/lib/bundler/runtime.rb:61:in `each'
/Users/sahil/.rvm/gems/ruby-1.9.3-p551@global/gems/bundler-1.10.6/lib/bundler/runtime.rb:61:in `require'
/Users/sahil/.rvm/gems/ruby-1.9.3-p551@global/gems/bundler-1.10.6/lib/bundler.rb:134:in `require'
/Users/sahil/Documents/work/ccprod/config/application.rb:9:in `<top (required)>'
/Users/sahil/Documents/work/ccprod/Rakefile:4:in `<top (required)>'
(See full trace by running task with --trace)

Please let me know if any other information is required. MySQL installed from mysql website. Additional Details:

Server version: 5.5.46 MySQL Community Server (GPL)

Update:
Gemfile.lock file:

GIT
  remote: git://github.com/acumenbrands/acts_as_slugable.git
  revision: 51c739b8dc283483e8cb68be2f48f0742dadbf3d
  specs:
    acts_as_slugable (1.0)
      activerecord (>= 3.0.0)

GIT
  remote: git://github.com/paneq/calendar_date_select.git
  revision: 977048211b94599fe0f08eb37a481f3d69df48f6
  specs:
    calendar_date_select (1.16.2)

GIT
  remote: git://github.com/rails/prototype_legacy_helper.git
  revision: a2cd95c3e3c1a4f7a9566efdab5ce59c886cb05f
  specs:
    prototype_legacy_helper (0.0.0)

GIT
  remote: https://github.com/Gonzih/respond_to_parent.git
  revision: e7399307d70d00951916fd5e396c919cd7bb7f77
  specs:
    respond_to_parent (0.0.3)
      rails (~> 3.2)

GIT
  remote: https://github.com/jwhitehorn/acts_as_versioned.git
  revision: 44dfe632ba8c97c786cbc172a2da18a41b17f668
  specs:
    acts_as_versioned (3.2.1)
      activerecord

GEM
  remote: http://rubygems.org/
  specs:
    actionmailer (3.2.14)
      actionpack (= 3.2.14)
      mail (~> 2.5.4)
    actionpack (3.2.14)
      activemodel (= 3.2.14)
      activesupport (= 3.2.14)
      builder (~> 3.0.0)
      erubis (~> 2.7.0)
      journey (~> 1.0.4)
      rack (~> 1.4.5)
      rack-cache (~> 1.2)
      rack-test (~> 0.6.1)
      sprockets (~> 2.2.1)
    active_scaffold (3.3.3)
      rails (~> 3.2.0)
    activemodel (3.2.14)
      activesupport (= 3.2.14)
      builder (~> 3.0.0)
    activerecord (3.2.14)
      activemodel (= 3.2.14)
      activesupport (= 3.2.14)
      arel (~> 3.0.2)
      tzinfo (~> 0.3.29)
    activeresource (3.2.14)
      activemodel (= 3.2.14)
      activesupport (= 3.2.14)
    activesupport (3.2.14)
      i18n (~> 0.6, >= 0.6.4)
      multi_json (~> 1.0)
    acts-as-taggable-on (3.0.0)
      rails (>= 3, < 5)
    addressable (2.3.5)
    arel (3.0.3)
    asset_sync (1.0.0)
      activemodel
      fog (>= 1.8.0)
    atomic (1.1.14)
    autoparse (0.3.3)
      addressable (>= 2.3.1)
      extlib (>= 0.9.15)
      multi_json (>= 1.0.0)
    aws-sdk (1.31.3)
      json (~> 1.4)
      nokogiri (>= 1.4.4)
      uuidtools (~> 2.1)
    axiom-types (0.1.0)
      descendants_tracker (~> 0.0.3)
      ice_nine (~> 0.11.0)
      thread_safe (~> 0.1.3)
    babosa (0.3.11)
    bcrypt-ruby (3.1.2)
    better_errors (1.1.0)
      coderay (>= 1.0.0)
      erubis (>= 2.6.6)
    binding_of_caller (0.7.2)
      debug_inspector (>= 0.0.1)
    builder (3.0.4)
    bullet (4.7.1)
      activesupport
      uniform_notifier (>= 1.4.0)
    canonix (0.1.1)
    carrierwave (0.9.0)
      activemodel (>= 3.2.0)
      activesupport (>= 3.2.0)
      json (>= 1.7)
    celluloid (0.15.2)
      timers (~> 1.1.0)
    chartkick (1.3.2)
    chronic (0.10.2)
    ckeditor (4.0.7)
      mime-types
      orm_adapter
    climate_control (0.0.3)
      activesupport (>= 3.0)
    cocaine (0.5.3)
      climate_control (>= 0.0.3, < 1.0)
    coderay (1.1.0)
    coercible (1.0.0)
      descendants_tracker (~> 0.0.1)
    coffee-rails (3.2.2)
      coffee-script (>= 2.2.0)
      railties (~> 3.2.0)
    coffee-script (2.2.0)
      coffee-script-source
      execjs
    coffee-script-source (1.6.3)
    commonjs (0.2.7)
    connection_pool (1.2.0)
    crack (0.4.1)
      safe_yaml (~> 0.9.0)
    daemons (1.1.9)
    debug_inspector (0.0.2)
    delayed_job (4.0.0)
      activesupport (>= 3.0, < 4.1)
    delayed_job_active_record (4.0.0)
      activerecord (>= 3.0, < 4.1)
      delayed_job (>= 3.0, < 4.1)
    delayed_job_web (1.2.10)
      activerecord (> 3.0.0)
      delayed_job (> 2.0.3)
      sinatra (>= 1.4.4)
    descendants_tracker (0.0.3)
    devise (3.2.2)
      bcrypt-ruby (~> 3.0)
      orm_adapter (~> 0.1)
      railties (>= 3.2.6, < 5)
      thread_safe (~> 0.1)
      warden (~> 1.2.3)
    devise-encryptable (0.1.2)
      devise (>= 2.1.0)
    dotenv (0.9.0)
    dynamic_form (1.1.4)
    equalizer (0.0.9)
    erubis (2.7.0)
    event-calendar (2.3.3)
    eventmachine (1.0.3)
    exception_notification (4.0.1)
      actionmailer (>= 3.0.4)
      activesupport (>= 3.0.4)
    excon (0.31.0)
    execjs (2.0.2)
    extlib (0.9.16)
    faraday (0.8.8)
      multipart-post (~> 1.2.0)
    fattr (2.2.1)
    fog (1.19.0)
      builder
      excon (~> 0.31.0)
      formatador (~> 0.2.0)
      mime-types
      multi_json (~> 1.0)
      net-scp (~> 1.1)
      net-ssh (>= 2.1.3)
      nokogiri (~> 1.5)
      ruby-hmac
    font-awesome-rails (4.2.0.0)
      railties (>= 3.2, < 5.0)
    foreman (0.63.0)
      dotenv (>= 0.7)
      thor (>= 0.13.6)
    formatador (0.2.4)
    god (0.13.4)
    google-api-client (0.6.4)
      addressable (>= 2.3.2)
      autoparse (>= 0.3.3)
      extlib (>= 0.9.15)
      faraday (~> 0.8.4)
      jwt (>= 0.1.5)
      launchy (>= 2.1.1)
      multi_json (>= 1.0.0)
      signet (~> 0.4.5)
      uuidtools (>= 2.1.0)
    grape (0.11.0)
      activesupport
      builder
      hashie (>= 2.1.0)
      multi_json (>= 1.3.2)
      multi_xml (>= 0.5.2)
      rack (>= 1.3.0)
      rack-accept
      rack-mount
      virtus (>= 1.0.0)
    hashie (3.4.0)
    highline (1.6.20)
    hike (1.2.3)
    httpauth (0.2.0)
    i18n (0.6.9)
    ice_nine (0.11.1)
    journey (1.0.4)
    jquery-rails (3.0.4)
      railties (>= 3.0, < 5.0)
      thor (>= 0.14, < 2.0)
    json (1.8.1)
    jwt (0.1.8)
      multi_json (>= 1.5)
    launchy (2.4.2)
      addressable (~> 2.3)
    less (2.5.1)
      commonjs (~> 0.2.7)
    less-rails (2.5.0)
      actionpack (>= 3.1)
      less (~> 2.5.0)
    libv8 (3.16.14.3)
    macaddr (1.6.1)
      systemu (~> 2.5.0)
    mail (2.5.4)
      mime-types (~> 1.16)
      treetop (~> 1.4.8)
    memcache-client (1.8.5)
    mime-types (1.25.1)
    mini_magick (3.7.0)
      subexec (~> 0.2.1)
    mono_logger (1.1.0)
    multi_json (1.8.2)
    multi_xml (0.5.5)
    multipart-post (1.2.0)
    mysql2 (0.3.14)
    net-scp (1.1.2)
      net-ssh (>= 2.6.5)
    net-ssh (2.8.0)
    nokogiri (1.5.9)
    oauth (0.4.7)
    oauth2 (0.9.2)
      faraday (~> 0.8)
      httpauth (~> 0.2)
      jwt (~> 0.1.4)
      multi_json (~> 1.0)
      multi_xml (~> 0.5)
      rack (~> 1.2)
    options (2.3.0)
      fattr
    orm_adapter (0.5.0)
    paperclip (3.5.2)
      activemodel (>= 3.0.0)
      activesupport (>= 3.0.0)
      cocaine (~> 0.5.3)
      mime-types
    polyglot (0.3.3)
    pr_geohash (1.0.0)
    progress_bar (1.0.0)
      highline (~> 1.6.1)
      options (~> 2.3.0)
    prototype-rails (3.2.1)
      rails (~> 3.2)
    rack (1.4.5)
    rack-accept (0.4.5)
      rack (>= 0.4)
    rack-cache (1.2)
      rack (>= 0.4)
    rack-mount (0.8.3)
      rack (>= 1.0.0)
    rack-protection (1.5.3)
      rack
    rack-ssl (1.3.3)
      rack
    rack-test (0.6.2)
      rack (>= 1.0)
    rails (3.2.14)
      actionmailer (= 3.2.14)
      actionpack (= 3.2.14)
      activerecord (= 3.2.14)
      activeresource (= 3.2.14)
      activesupport (= 3.2.14)
      bundler (~> 1.0)
      railties (= 3.2.14)
    rails-dev-tweaks (0.6.1)
      actionpack (~> 3.1)
      railties (~> 3.1)
    rails_autolink (1.1.5)
      rails (> 3.1)
    railties (3.2.14)
      actionpack (= 3.2.14)
      activesupport (= 3.2.14)
      rack-ssl (~> 1.3.2)
      rake (>= 0.8.7)
      rdoc (~> 3.4)
      thor (>= 0.14.6, < 2.0)
    rake (10.1.1)
    rdoc (3.12.2)
      json (~> 1.4)
    redis (3.0.6)
    redis-namespace (1.4.1)
      redis (~> 3.0.4)
    ref (1.0.5)
    resque (1.25.2)
      mono_logger (~> 1.0)
      multi_json (~> 1.0)
      redis-namespace (~> 1.3)
      sinatra (>= 0.9.2)
      vegas (~> 0.1.2)
    resque-web (0.0.6)
      coffee-rails
      jquery-rails
      resque
      sass-rails
      twitter-bootstrap-rails
    roo (1.13.2)
      nokogiri
      rubyzip
      spreadsheet (> 0.6.4)
    rsolr (1.0.9)
      builder (>= 2.1.2)
    ruby-hmac (0.4.0)
    ruby-ole (1.2.11.7)
    ruby-saml (0.7.2)
      canonix (= 0.1.1)
      nokogiri
      uuid (~> 2.3)
    rubyzip (1.1.0)
    safe_yaml (0.9.7)
    sass (3.2.13)
    sass-rails (3.2.6)
      railties (~> 3.2.0)
      sass (>= 3.1.10)
      tilt (~> 1.3)
    sentimental (1.0.3)
    sidekiq (2.17.2)
      celluloid (>= 0.15.2)
      connection_pool (>= 1.0.0)
      json
      redis (>= 3.0.6)
      redis-namespace (>= 1.3.1)
    signet (0.4.5)
      addressable (>= 2.2.3)
      faraday (~> 0.8.1)
      jwt (>= 0.1.5)
      multi_json (>= 1.0.0)
    simple_oauth (0.2.0)
    sinatra (1.4.5)
      rack (~> 1.4)
      rack-protection (~> 1.4)
      tilt (~> 1.3, >= 1.3.4)
    spreadsheet (0.9.6)
      ruby-ole (>= 1.0)
    sprockets (2.2.2)
      hike (~> 1.2)
      multi_json (~> 1.0)
      rack (~> 1.0)
      tilt (~> 1.1, != 1.3.0)
    subexec (0.2.3)
    sunspot (2.1.0)
      pr_geohash (~> 1.0)
      rsolr (~> 1.0.7)
    sunspot-queue (0.10.2)
      sunspot_rails (>= 1.3.0)
    sunspot_rails (2.1.0)
      nokogiri
      rails (>= 3)
      sunspot (= 2.1.0)
    sunspot_solr (2.1.0)
    systemu (2.5.2)
    therubyracer (0.12.1)
      libv8 (~> 3.16.14.0)
      ref
    thin (1.6.1)
      daemons (>= 1.0.9)
      eventmachine (>= 1.0.0)
      rack (>= 1.0.0)
    thor (0.18.1)
    thread_safe (0.1.3)
      atomic
    tilt (1.4.1)
    timers (1.1.0)
    treetop (1.4.15)
      polyglot
      polyglot (>= 0.3.1)
    turbo-sprockets-rails3 (0.3.11)
      railties (> 3.2.8, < 4.0.0)
      sprockets (>= 2.2.0)
    twitter-bootstrap-rails (2.2.8)
      actionpack (>= 3.1)
      execjs
      rails (>= 3.1)
      railties (>= 3.1)
    tzinfo (0.3.38)
    uglifier (2.4.0)
      execjs (>= 0.3.0)
      json (>= 1.8.0)
    uniform_notifier (1.4.0)
    uuid (2.3.7)
      macaddr (~> 1.0)
    uuidtools (2.1.4)
    vegas (0.1.11)
      rack (>= 1.0.0)
    virtus (1.0.4)
      axiom-types (~> 0.1)
      coercible (~> 1.0)
      descendants_tracker (~> 0.0, >= 0.0.3)
      equalizer (~> 0.0, >= 0.0.9)
    warden (1.2.3)
      rack (>= 1.0)
    webmock (1.16.1)
      addressable (>= 2.2.7)
      crack (>= 0.3.2)
    whenever (0.9.0)
      activesupport (>= 2.3.4)
      chronic (>= 0.6.3)
    wicked_pdf (0.11.0)
      rails
    will_paginate (3.0.7)
    will_paginate-bootstrap (1.0.1)
      will_paginate (>= 3.0.3)
    wkhtmltopdf-binary (0.9.9.3)
    youtube_it (2.3.2)
      builder
      excon
      faraday (~> 0.8)
      json (~> 1.8.0)
      nokogiri (~> 1.5.2)
      oauth (~> 0.4.4)
      oauth2 (~> 0.6)
      simple_oauth (>= 0.1.5)
      webmock

PLATFORMS
  ruby

DEPENDENCIES
  active_scaffold
  acts-as-taggable-on
  acts_as_slugable!
  acts_as_versioned!
  asset_sync
  aws-sdk
  babosa
  better_errors
  binding_of_caller
  bullet
  calendar_date_select!
  carrierwave
  chartkick
  ckeditor
  coderay
  coffee-rails
  delayed_job_active_record
  delayed_job_web
  devise
  devise-encryptable
  dynamic_form
  event-calendar
  exception_notification
  font-awesome-rails
  foreman
  god
  google-api-client
  grape
  jquery-rails
  less-rails
  memcache-client
  mini_magick
  mysql2 (>= 0.3)
  nokogiri (= 1.5.9)
  paperclip
  progress_bar
  prototype-rails
  prototype_legacy_helper (= 0.0.0)!
  rails (= 3.2.14)
  rails-dev-tweaks (~> 0.6.1)
  rails_autolink
  respond_to_parent!
  resque
  resque-web
  roo
  ruby-saml
  sass-rails
  sentimental
  sidekiq
  sunspot-queue
  sunspot_rails
  sunspot_solr
  therubyracer
  thin
  turbo-sprockets-rails3
  uglifier
  whenever
  wicked_pdf
  will_paginate (~> 3.0)
  will_paginate-bootstrap
  wkhtmltopdf-binary
  youtube_it

database.yml:

# MySQL.  Versions 4.1 and 5.0 are recommended.
#
# Install the MySQL driver:
#   gem install mysql2
#
# And be sure to use new-style password hashing:
#   http://dev.mysql.com/doc/refman/5.0/en/old-client.html
development:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  database: db_development
  pool: 5
  username: root
  password: xyz
  socket: /var/run/mysqld/mysqld.sock

The steps which worked in Ubuntu for setting up Rails:

Installation of rvm and ruby in 12.04(Followed the link) 
https://www.digitalocean.com/community/articles/how-to-install-ruby-on-rails-on-ubuntu-12-04-lts-precise-pangolin-with-rvm 
the steps are: 

sudo apt-get update 
sudo apt-get install curl 
curl -L https://get.rvm.io | bash -s stable 
source ~/.rvm/scripts/rvm 
rvm requirements(error will occur - not to worry. Go to the link provided to install the package-----) 
rvm autolibs rvm_pkg
again give -> rvm requirements 
rvm install 1.9.3 
rvm use 1.9.3 



get the code and do inside it
bundle install 

later check with rails s.. if not working. do as follows 
gem uninstall -i /home/user_xyz/.rvm/gems/ruby-1.9.3-p448@global bundler 

then install 
gem install bundler -v1.0.22 

install git 
sudo apt-get install git 
 then 
bundle install --system 

then again do 
bundle install 

If the bundle install --system is not working 
gem install bundler --pre 

again give 
bundle install --system 

It will ask to install the mysql2 
install the mysql2 
sudo apt-get install mysql2 -v0.3.13 

again give 
bundle install --system 

then install the following for the mysql error 
sudo apt-get install libmysql-ruby libmysqlclient-dev 

After the mysql error. nokogiri error occurs 
sudo apt-get install libxslt-dev libxml2-dev 
sudo gem install nokogiri 

finally give 
bundle install --system 

install netbeans 
first install java package 
sudo apt-get install openjdk-7-jdk 
sh netbeans-7.0.1-ml-linux.sh 

Proceed as follows(Due to erros do the following)
gem uninstall bundler 
bundle install 
rvm @global do gem uninstall bundler 
gem update bundle 
bundle install --system 
Error for event machine(Check the link: http://stackoverflow.com/questions/4735303/failed-to-install-gem-install-eventmachine-i-need-starling-in-my-project-fo) 
sudo apt-get install build-essential 
install event machine 
gem install eventmachine -v '1.0.3' 
bundle install --system 

install mysql 
sudo apt-get install mysql-server 
change the password in the config/database.yml for the mysql

Solution:
Steps followed to setup Rails:

• installed MySQL using brew:mysql Ver 14.14 Distrib 5.7.9, for
osx10.11 (x86_64) using EditLine wrapper. Followed the commands given onscreen after mysql installation.

• installed rvm with the following steps:

  curl -L https://get.rvm.io | bash -s stable —ruby

  rvm install 1.9.3

  rvm use 1.9.3

  rvm --default 1.9.3

• installed rails, gem install rails, current version is ‘4.2.5’.

(mysql2 gem version (0.3.20) woking with rails 4.1.4)

(mysql2 gem version (0.4.2) woking with rails 4.2.5)

(mysql2 gem version (0.3.20) woking with rails 3.2.14)

So, now I am able to create and run new rails app, but if I run any older rails app built on Ubuntu, it keeps throwing error even though bundle install completes successfully. The error message which I get:

Gem::LoadError: Specified 'mysql2' for database adapter, but the gem is not loaded. Add `gem 'mysql2'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).

The error messages keeps changing but all are related to mysql2 gem. I have deleted vendor/cache, Gemfile.lock from my older project but still no success.