Update to JSON.NET 6.0.4
Fix JSON.NET reference in Silverlight samples
Merge branch 'release' into dev

Conflicts:
	nuspecs/Microsoft.AspNet.SignalR.Client.nuspec
	samples/Microsoft.AspNet.SelfHost.Samples/packages.config
	samples/Microsoft.AspNet.SignalR.LoadTestHarness/packages.config
	samples/Microsoft.AspNet.SignalR.Samples/packages.config
	src/Microsoft.AspNet.SignalR.Client.Portable/packages.config
	src/Microsoft.AspNet.SignalR.Core/packages.config
	src/Microsoft.AspNet.SignalR.Crank/packages.config
	tests/Microsoft.AspNet.SignalR.Tests.Common/packages.config
Update JSON.NET to 6.0.4 in .NET client for wpa81