Updated build configuration.
Added custom gemfile for Mongoid 4 and updated Gemspec to allow for Mongoid 4.
Added Mongoid4.gemfile.lock to ignore list.
Wrapped scope condition in proc.
Merge branch 'feature-mongoid4' of git://github.com/plainprogrammer/mongoid-enum into plainprogrammer-feature-mongoid4
Removed RBX from travis matrix
Updated gitignore, travis build matrix and cleaned up gemspecs
Merge branch 'plainprogrammer-feature-mongoid4'
Merged plainprogrammer-feature-mongoid4