Add telemetry collection code to Winjs to be used in Microsoft WinJS fra...

...mework package.

2 files are added:
1. _telemetryImpl.js - which will be used when building Microsoft WinJS framework package
2. _telemetry.js - the default no-op file
I changed it to this.  Do I need to create another pull-request for this change?
              this._diagnostics = _WinRT.Windows.Foundation.Diagnostics;
              if (this._diagnostics) {