some ajax commnts
change response display in ajax
Merge branch 'develop' into feature/ajax_comments

* develop:
  add ru letter body
  remove gmail settings
  fix posts edit
  delete user_params
  delete credentials
  credentials
  finish mailer
  ignore mail settings
  use UserEditType
  add email to user
delete api foulder in views
Merge branch 'feature/ajax_comments' into develop

* feature/ajax_comments:
  delete api foulder in views
  change response display in ajax
  some ajax commnts