reverting back to SignalR 1.1.3 to support IIS classic pipeline mode

There are only 2 actual code changes, using HubConnectionContext instead of IHubCallerConnectionContext, which is new in signalr 2.0 and getting rid of owin startup class that was causing the break in classic pipeline mode.
I tested with IE, FF, and Chrome, with and without WebSockets and everything appears to be working.