Don't catch exceptions thrown from onReceived handlers in JS

- We still catch these exceptions in the .NET client since there seems
  to be no better way to allow developers to observe exceptions thrown
  in the Received handler

#1530
Don't run tests that require disabling window.onerror in Chutzpah
Updated .NET Client tests for throwing in Received
Added newline to JS Client test for throwing in onReceived
- Thanks Taylor
Removed errorInCallback from the DemoHub sample