update catarse_credits
Merge branch 'master' of github.com:catarse/catarse

* 'master' of github.com:catarse/catarse:
  use only one query
  only send every month
  fix cron tasks to use new notification system
fix contribution error messages
fix typo
Merge pull request #813 from adrianob/fix_contribution_error_messages

Fix contribution error messages
use channel specific meta tags for all channel pages
update link to new name
add user info to intercom
Merge pull request #815 from adrianob/intercom_info

add user info to intercom
use post title on meta tags when available
Merge pull request #814 from adrianob/more_metatags_fixes

More metatags fixes
fix state name
small refactor created method User#contributed_failed_projects
fixing bugs and changing some variables in intercom plugin
Merge pull request #818 from diogob/intercom_tweaks

Intercom tweaks
fix typo
removing the feedback box from devise
removing the feedback box from devise
Merge pull request #820 from pedromarins/feedback-toggle

removing the feedback toggle from registrations/new page