Add note to gemfile.
Update advertisement model to use modern syntax.
Fix redirect target.
Use new AR finder syntax.

--HG--
extra : amend_source : d1ae4eda6e171d4d68e48cc70ecf5f03b33dc855
Delete vote when it's set to less than or equal to 0.

And why is it even configurable.

--HG--
extra : amend_source : 9d1f3deec9c095b0d37700d66b73ea179f8616c4
Nuke all votes with score less than 1.
Update gems.
Merge from git.

--HG--
extra : amend_source : 83bce603655f5f22423791cad476c71344bf34fa