Google Analytics replaced by Google Tag Manager

Google Analytics upgraded to Universal Analytics and now used via Google Tag Manager. Google Tag parameter set in theme.conf file.

Change-Id: I8271e361807fb6fa9e646c39e7262ffac280393d
Closes-Bug: #1328123
(cherry picked from commit fa2fdfad6d7f63f198fa6a8e14a2af84c494a9b1)