Twitter bootstrap – Bootstrap 3 Glyphicons are not rendering properly in rails

I am using the following gems:

gem 'therubyracer', platforms: :ruby
#gem "therubyracer"
gem "less-rails" #Sprockets (what Rails 3.1 uses for its asset pipeline) supports LESS
gem "twitter-bootstrap-rails"

and in asset pipeline this is the code

*
 *= require_bootstrap_and_overrides
 *= require_self
 *= require_tree .
 */

and in bootstrap_and overrides file this is the code

@import "twitter/bootstrap/bootstrap";

// Set the correct sprite paths
@iconSpritePath: image-url("twitter/bootstrap/glyphicons-halflings.png");
@iconWhiteSpritePath: image-url("twitter/bootstrap/glyphicons-halflings-white.png");

// Set the Font Awesome (Font Awesome is default. You can disable by commenting below lines)
@fontAwesomeEotPath: font-url("fontawesome-webfont.eot");
@fontAwesomeEotPath_iefix: font-url("fontawesome-webfont.eot?#iefix");
@fontAwesomeWoffPath: font-url("fontawesome-webfont.woff");
@fontAwesomeTtfPath: font-url("fontawesome-webfont.ttf");
@fontAwesomeSvgPath: font-url("fontawesome-webfont.svg#fontawesomeregular");

// Font Awesome
//@import "fontawesome/font-awesome";

// Glyphicons
@import "twitter/bootstrap/glyphicons.less";

// Your custom LESS stylesheets goes here

//
// Since bootstrap was imported above you have access to its mixins which
// you may use and inherit here
//
// If you'd like to override bootstrap's own variables, you can do so here as well
// See http://twitter.github.com/bootstrap/customize.html#variables for their names and documentation
//
// Example:
// @link-color: #ff0000;
@import url(http://fonts.googleapis.com/css?family=Capriola);

and when i use the class <i class="fa fa-user"></i> like this glyphicon is showing. But for the class <i class="glyphicon glyphicon-user"></i
the glyphicon is not displaying the proper image.