Stop KA Lite opening new tabs in browser

This is for #2219 - initial fixes based on suggestions from @mikewray.

Hi @aronasorman, I've already fixed the one when clicking on the suggested videos.  I found within the source the following links open in another tab as well, mostly at the `/help/` url:
1. http://creativecommons.org/licenses/by-nc-sa/3.0/
2. http://kalitewiki.learningequality.org/
3. http://kalite.learningequality.org/faq
4. http://192.168.1.2:8008/ (or the installation's ip address)

The others are on the playlists like AcademicEarth and the `dateutil` link which I think are not relevant.

Should I also change the numbered items above?