VE-353: set up base tracking implementation (wraps MW tracking).
Merge branch 'dev' into VE-353

Conflicts:
	extensions/VisualEditor/wikia/modules/ve/init/ve.init.mw.WikiaViewPageTarget.js
Finish base tracking setup.
VE-353: remove redundant code.
Merge pull request #1925 from Wikia/VE-353

VE-353: setup base tracking for VisualEditor