basic impl. working
ordered scope
made comments layout nicer, added validations
comments counter_cache
set linelength to 90 max
merged schema with comments and committees
Merge branch 'feature/comments-model' into develop

* feature/comments-model:
  comments counter_cache
  made comments layout nicer, added validations
  ordered scope
  basic impl. working

Conflicts:
	db/schema.rb