Moved repeated code with db selection into environment.js
Added diff method to Tag model
Merge branch 'master' of https://github.com/epicmonkey/pepyatka
Added extract and update methods and changed diff method in Tag model
Added tags synchronizer
Refactored Tag.extract with async.reduce()
Fixed Tag.diff()
Fixed Tag.extract()
Implemented tag-stats updating for Post model
Implemented tag-stats updating for Comment model
Fixed copypaste in Post and Comment models