Bug 810146: Add telemetry for addon manager startup times, unpacked add-ons and various changes detected at startup r=Mossop

--HG--
rename : browser/modules/TelemetryTimestamps.jsm => toolkit/modules/TelemetryTimestamps.jsm
rename : browser/modules/test/browser_TelemetryTimestamps.js => toolkit/modules/tests/browser_TelemetryTimestamps.js
Bug 837212: convert browser_TelemetryTimestamps.js to an xpcshell test r=Felipe

--HG--
rename : toolkit/modules/tests/browser_TelemetryTimestamps.js => toolkit/modules/tests/xpcshell/test_TelemetryTimestamps.js