Removes Owin appstartup disable line from Web.config.
Removes Owin appstartup disable line from Web.config.

This was preventing SignalR subsystem from starting, aside of the fact
that Startup.cs was not being built in any VS not v11, v12 or v14.

extnet/Ext.NET.Examples,extnet/Ext.NET.Examples,extnet/Ext.NET.Examples