Moving apps we modified heavily into the kalite folder

First PR for 0.12!

Have defined project structure here:
https://github.com/learningequality/ka-lite/wiki/Project-structure

In order to accomplish this, two apps that we've modified heavily need to be moved into the `kalite` folder:
* chronograph
* django_cherrypy_blah

Note that this fits with how we handled the `faq` and `registration` apps.

@jamalex i know the project structure was largely your design, so if you have a moment to review in the next day or two, would be great!