Remove dependency on full Rails
Remove dependency on full Rails

`railties` has most of Rails dependencies and will not depend on `activerecord` for example. Since we use Sequel rather than ActiveRecord, requiring sassc was the culprit for adding activerecord to the bundle for no good reason.
sass/sassc-rails,sass/sassc-rails,bolandrm/sassc-rails,bolandrm/sassc-rails,sass/sassc-rails