Use stable compass-rails

compass-rails 1.1.x works with Rails 4 and 2.0.alpha.0 has been janked

See: https://github.com/Compass/compass-rails/commit/2c54193cdda7b152135a908c9481dca83f32045d
Merge pull request #434 from ahx/use-compass-rails-stable

Use stable compass-rails