Renames WordCollection; Refactors code; Adds tests
Adds Persisted Word Collection
Skips persistence of word
Uses ruby 2.0.0 on heroku - https://blog.heroku.com/archives/2012/11/5/ruby-2-preview-on-heroku
Skips persistence of word (2)
Removes PersistedSpellingCorrector#initializer, it has conflict with mongoid