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
Q: in the future, who will be calling WinJS.Utilities._telemetry.send(..) ? WinJS code itself? App Code?