Fix File to import not found or unreadable: font-awesome-sprockets

Patch from resque#163

Author: diei

app/assets/stylesheets/resque_web/bootstrap_and_overrides.css.scss.erb

@@ -2,7 +2,6 @@
   =require twitter-bootstrap-static/bootstrap
   */
 
-@import "font-awesome-sprockets";
 @import "font-awesome";
 
 html {