Merge pull request #31 from Ravenstine/master

Refactor tests
Refactor is_authorized? so it has the logic centralized in one location for changes later.
Change control_update to control in order to clarify its purpose.
Make chat accessible to authorized users only.
Add authorization for chat in chat_controller.
Refactor drawings_controller to use is_authorized? method.
Merge pull request #39 from nicolejpaz/chat_owner_only

Chat for authorized users only