update tracing for SB ConfigurationErrorsException
update tracing error message for SB ConfigurationErrorsException
Updated version to 2.0.3
#2753 context.User is null on disconnect event
Updated version number in hubs.js
build break fix
Merge branch 'release' into dev

Conflicts:
	build/Microsoft.AspNet.SignalR.versions.targets
	samples/Microsoft.AspNet.SignalR.Samples/Scripts/hubs.js
	src/Common/CommonVersionInfo.cs
	src/Microsoft.AspNet.SignalR.Client.JS/jquery.signalR.core.js
	src/Microsoft.AspNet.SignalR.Client.JS/jquery.signalR.version.js
	src/Microsoft.AspNet.SignalR.Client/Connection.cs
	src/Microsoft.AspNet.SignalR.Core/Scripts/hubs.js
	xamarin/SignalRPackage/component/component.yaml