Merge pull request #178 from ck3g/fix-unchecking-favorite-languages

Fix unchecking favorite languages
Remove usernames from database.yml
Update schema
Merge pull request #180 from mrgilman/remove_db_usernames

Remove usernames from database.yml
Merge pull request #181 from mrgilman/update_schema

Update schema
Merge pull request #177 from ck3g/fix_issue_valid_for_user_test

Stub Issue#closed? and Issue#commenting_users
Unsubscribe (delete account) with one click

Well, two actually. Re: Issue #135
Merge pull request #179 from philtr/one-click-unsubscribe

Unsubscribe (delete account) with one click
Test and refactoring of RepoSubscriptionsController

  * Add tests for update and destroy actions
  * Replace `where().first` with `find` to avoid errors
    `undefined method destroy for NilClass` when subscription not found