Prepend theme template paths

Allow templates override.
Stop using JavaScript to set the body CSS class

This prevents everything from blinking, since the CSS class will be
present when the page is rendering.
Prevent from tabbing on tos and honor links
Remove autoplay for video in course about page

The iframe was generated with autoplay=1, which, sometimes, would cause
the video to play in the background.
Add create_account server events to tracking log
Use bulk email as is for course email