added support for mongoid 5.0
added support for mongoid 5.0

yangc5/playlister-sinatra-v-000,fajrif/database_cleaner,custora/database_cleaner,yangc5/playlister-sinatra-v-000,awilkening/database_cleaner,simonmorley/database_cleaner,reinaris/database_cleaner,amorphid/database_cleaner,yangc5/playlister-sinatra-v-000,DatabaseCleaner/database_cleaner,ericraio/database_cleaner,yangc5/playlister-sinatra-v-000,eliotsykes/database_cleaner,yangc5/playlister-sinatra-v-000,yangc5/playlister-sinatra-v-000,glebtv/database_cleaner,DatabaseCleaner/database_cleaner,yangc5/playlister-sinatra-v-000