Add the Ability to Review Lobby Requests -- Refs #24
This MR creates a feature for reviewing lobby requests.
In this flow admins can add comments to lobby requests, and lobby request creators can edit the reason part of their requests accordingly. This exchange can go on until admin understands the reason enough to accept or reject the request.
This MR can build on !8 to notify both admin and request creator of updates made by the other, along with the appropriate url for them to view the thread.
Till then, admin can view the thread of comments from the admin page of the particular lobby request while request creator can view the thread from the endpoint /lobby-requests/<username>/
Closes #24