ADEN-704 ivw tracking upgrade (1:1 from docs)
ADEN-704 ivw tracking upgrade (1:1 from docs)
ADEN-704 ivw tracking upgrade (tests)
ADEN-704 ivw tracking upgrade (document.write out)
Merge remote-tracking branch 'origin/aden-704-ivw-tracking-upgrade' into dev

Conflicts:
	extensions/wikia/AnalyticsEngine/AnalyticsProviderIVW2.php
Merge pull request #2152 from Wikia/aden-704-ivw-tracking-upgrade

Aden 704 ivw tracking upgrade