VE-766: add tracking for CK edit-page impression
VE-766: normalize tracking between editors
VE-766: normalize values to rounded milliseconds.
VE-766: more descriptive name for VE ready + page load time event.
VE-766: add comment for non ve.track tracking call.
VE-766: use Wikia.Tracker for edit/edit section links so we can track them before VE is loaded.
VE-766: funnel all durations through a single normalizing function.
VE-766: better commenting and one normalizeDuration miss.
Merge branch 've-sprint-9' into VE-766

Conflicts:
	extensions/VisualEditor/wikia/modules/ve/ve.track.js
Merge pull request #2790 from Wikia/VE-766

VE-766
Merge branch 've-sprint-11' into dev