Target net45 in ServiceBus3 (SignalR#3908)

move UWP Client JSON.Net dep back to 6.0.4

Revert "Stop processing messages before ending the WebSocketFunc Task"

This reverts commit 654bfb4.

Disable keep alive checks in long polling transport - .NET

Update to JSON.NET 6.0.4

Removed the old OnDisonnected overload

- Removing the old overload is preferable to changing its behavior

SignalR#3115

Invert logic to raise long polling reconnects on the server

- Checking for "/poll" to suppress reconnects does not work since 1.0.*
  clients do not append anything to the URL of poll requests.
- Raising reconnects only  for long polling requests ending with
  "/reconnect" preserves the old server behavior
- This prevents 1.0.* clients from causing a reconnect per poll

SignalR#3044

Removed Lazy initialization for Service Bus

SignalR#2948

update to call clearTimeout for connection._.pingLoopId

update tracing error message for SB ConfigurationErrorsException