Correct Whitespace

JS code standard: No trailing whitespace
Move analytics loading scripts into separate JS file

This file is added to the list of files to load syncronously (from
debug).
Update the WDN analytics plugin to support Universal Analytics API

See
https://developers.google.com/analytics/devguides/collection/analyticsjs/

Our abstraction continues to support both versions of Google Analytics
while others make the necessary code migration. The main UNL property
has already made this transition.
Avoid binding to async window.ga function

Uses custom function to prevent reusing the ga queuing function after
analytics has loaded.
Update js build script to include our ga.js
Update the scroll depth analytics plugin to use API from analytics only