uninitialized constant Compass::Frameworks with compass-import-once

[boxofrox]

The compass devs created a stand-alone extension, compass-import-once. When added to a Rails 4.2 Gemfile beside bootstrap-sass-3.3.4, rails server fails with the error message:

/home/user/.rvm/gems/ruby-2.1.2@rails-app/gems/bootstrap-sass-3.3.4.1/lib/bootstrap-sass.rb:63:in `register_compass_extension': uninitialized constant Compass::Frameworks (NameError)
        from /home/user/.rvm/gems/ruby-2.1.2@rails-app/gems/bootstrap-sass-3.3.4.1/lib/bootstrap-sass.rb:6:in `load!'
        from /home/user/.rvm/gems/ruby-2.1.2@rails-app/gems/bootstrap-sass-3.3.4.1/lib/bootstrap-sass.rb:84:in `<top (required)>'
        from /home/user/.rvm/gems/ruby-2.1.2@global/gems/bundler-1.9.6/lib/bundler/runtime.rb:76:in `require'
        from /home/user/.rvm/gems/ruby-2.1.2@global/gems/bundler-1.9.6/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
        from /home/user/.rvm/gems/ruby-2.1.2@global/gems/bundler-1.9.6/lib/bundler/runtime.rb:72:in `each'
        from /home/user/.rvm/gems/ruby-2.1.2@global/gems/bundler-1.9.6/lib/bundler/runtime.rb:72:in `block in require'
        from /home/user/.rvm/gems/ruby-2.1.2@global/gems/bundler-1.9.6/lib/bundler/runtime.rb:61:in `each'
        from /home/user/.rvm/gems/ruby-2.1.2@global/gems/bundler-1.9.6/lib/bundler/runtime.rb:61:in `require'
        from /home/user/.rvm/gems/ruby-2.1.2@global/gems/bundler-1.9.6/lib/bundler.rb:134:in `require'
        from /home/user/files/development/rails-app/repo/config/application.rb:8:in `<top (required)>'
        from /home/user/.rvm/gems/ruby-2.1.2@rails-app/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:78:in `require'
        from /home/user/.rvm/gems/ruby-2.1.2@rails-app/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:78:in `block in server'
        from /home/user/.rvm/gems/ruby-2.1.2@rails-app/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:75:in `tap'
        from /home/user/.rvm/gems/ruby-2.1.2@rails-app/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:75:in `server'
        from /home/user/.rvm/gems/ruby-2.1.2@rails-app/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
        from /home/user/.rvm/gems/ruby-2.1.2@rails-app/gems/railties-4.2.1/lib/rails/commands.rb:17:in `<top (required)>'
        from /home/user/files/development/rails-app/repo/bin/rails:8:in `require'
        from /home/user/files/development/rails-app/repo/bin/rails:8:in `<top (required)>'
        from /home/user/.rvm/gems/ruby-2.1.2@rails-app/gems/spring-1.3.5/lib/spring/client/rails.rb:28:in `load'
        from /home/user/.rvm/gems/ruby-2.1.2@rails-app/gems/spring-1.3.5/lib/spring/client/rails.rb:28:in `call'
        from /home/user/.rvm/gems/ruby-2.1.2@rails-app/gems/spring-1.3.5/lib/spring/client/command.rb:7:in `call'
        from /home/user/.rvm/gems/ruby-2.1.2@rails-app/gems/spring-1.3.5/lib/spring/client.rb:26:in `run'
        from /home/user/.rvm/gems/ruby-2.1.2@rails-app/gems/spring-1.3.5/bin/spring:48:in `<top (required)>'
        from /home/user/.rvm/gems/ruby-2.1.2@rails-app/gems/spring-1.3.5/lib/spring/binstub.rb:11:in `load'
        from /home/user/.rvm/gems/ruby-2.1.2@rails-app/gems/spring-1.3.5/lib/spring/binstub.rb:11:in `<top (required)>'
        from /home/user/files/development/rails-app/repo/bin/spring:13:in `require'
        from /home/user/files/development/rails-app/repo/bin/spring:13:in `<top (required)>'
        from bin/rails:3:in `load'
        from bin/rails:3:in `<main>'

I recommend changing the compass? method to check for ::Compass::Frameworks instead of only ::Compass in bootstrap-sass.rb:44.

Pull request will follow.