added 'twitter-bootstrap-rails gem'
fixed application template
bootstrap for posts form
bootstrap for posts edit, new, comment_fields
bootstrap for posts show
bootstrap for comments
Merge branch 'feature/bootstrap' into develop

* feature/bootstrap:
  bootstrap for comments
  bootstrap for posts show
  bootstrap for posts edit, new, comment_fields
  bootstrap for posts form
  fixed application template
  added 'twitter-bootstrap-rails gem'