Add telemetry collection code to Winjs to be used in Microsoft WinJS framework 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
Code review changes.

Signed-off-by: MythiliM <mythilim@MythiliMLaptop.redmond.corp.microsoft.com>
Signed-off-by: MythiliM <mythilim@microsoft.com>
Signed-off-by: MythiliM <mythilim@microsoft.com>
Merge pull request #659 from MythiliM/master

Add Telemetry infrastructure for Windows Store