Update depedencies

I updated Concord, Abstract_Type, SASS and Coffee-Script.

In order to run the specs, I had to update the Devtools Gemfile as well. The old version used RSpec 2, but the current Devtools version is already on RSpec 3 which will cause trouble with 'its' without the new 'rspec-its' gem.

The gem version is already set to 0.0.11. Please release the Gem. I need it. :P