remove bootstrap dependency and implement bootstrap v2.2 statically
remove bootstrap files from app/assets/stylesheets/*
remove bootstrap reference from lib/rails_engine/engine.rb
Merge pull request #1 from bensheldon/bootstrap2-dependency-patch

remove bootstrap reference from lib/rails_engine/engine.rb
Added compability for Font-Awesome 4

Font awesome 4 introduced a new naming convention.
I did'nt use new naming convention because:
 * It's backward incompatible and people still use old version of Font-Awesome
 * rails_admin use old naming convention(icon-*) in javascripts.

I added a new scss file which add compability for Font-Awsome 4 uwing extend.
Merge branch 'font-awesome-4' of https://github.com/bukhamseen/rails_admin
Merge branch 'bootstrap2-dependency-patch' of https://github.com/bulleric/rails_admin