69139858 Added active_record validations
69139858 Added js char counter
69139858 IE7 small css fix
69139858 content model - corrected validation
Merge pull request #50 from bitzesty/69139858-limit-the-length-of-string-fields

69139858 limit the length of string fields
68002996 Comments: ability to reply

- added base functionality
- added mailer
- added permission policy for reply
68002996 Comments: ability to reply

- corrected mailer
- added comment replies page
  - this page displays parent comment and all replies
  - user can add one more reply on this page
  - we will redirect to this page from mailer
68002996 Comments: ability to reply

- added Rspec checks for:
  - review replies
  - reply from commentable association
  - reply from comment replies page
68002996 Comments: ability to reply

- covered reply comment email notification with Rspec