created application.yml with sample user
created comment model with relations
added the siplest comments view in post
added CRUD operations to comments
added voting system (needs improvment)
enhance vote view, fix some errors, added field to_discuss to vote model
added pots hotness system and fixed tags system in post#index
updated comments ordering to desc and production environment for mongo
configuration for deploying
propably final implementation of mongoid.yml & updated readme