must using less 2.3.3 version since 2.4.0 will cause below problem:

icome@cvprcsip01:/home/icome/icome$ rake assets:precompile
I, [2014-02-24T09:43:40.142253 #26782]  INFO -- : Writing /home/icome/icome/public/assets/application-265e64f39909e8cbb18bced01834e987.js
rake aborted!
.rotate is undefined
  (in /home/icome/icome/app/assets/stylesheets/metro-ui-css-and-overrides.less)
at /usr/local/rvm/gems/ruby-2.0.0-p353/gems/less-2.4.0/lib/less/js/lib/less/parser.js:424:31
/usr/local/rvm/gems/ruby-2.0.0-p353/gems/less-2.4.0/lib/less/parser.rb:100:in `block in to_css'