Unit tests refactor
Added unit tests for memory and disk persistence
Removed brackets
Added CoffeeScript 'class'
Updated database to @database
Fixed _checkCollection method
Added checkCollection on findOne, find, update and remove
Removed duplicity
Fixed clear database
Added more specs
Init Gulpfile
Added unit tests for collection that not exist
Added unit test for update an element that not exist
Added unit test for remove item that not exist
Fixed update and remove methods
Updated README