Merge pull request #851 from cmaish/allowed-command

Add allowed command
Removed EnsureAllowed from IChatService
Updated everything
Work around bug in FormsAuthMiddleware
Fixed squish it.
Updated WebApi.Owin
Fix close icon on Retina screen
Format Web.config
Align comments in web.config properly.
Updated to the latest client.
Fix JabbR.Client.
Made some changes to JabbR.Client.
- Made IClientTransport a transport factory instead
  to allow reconnect to work properly
- Made default trace level All.
Try to preserve the user's identity for older cookie formats.
Updated the response cookie on conversion.
Updated signalr.exe
Remove WebApi from test project.
When join fails on reconnect logout
May help mitigate #852