Refactor django-knockout-modeler to s/knockout/ember/

Squashed commit of the following:

commit 5b0c20da5d5b65f5aa59da57bfd1eed445be437d
Author: Paul Tiplady <paultiplady@gmail.com>
Date:   Wed Apr 9 16:24:51 2014 -0700

    Cleanup dead code.

commit 43895abe10b23f74bf9b55ad17c4ce143a133a20
Author: Paul Tiplady <paultiplady@gmail.com>
Date:   Sun Mar 23 13:13:16 2014 -0700

    First working checkin, generating Ember models only.

commit 664c2e86b2b7b0cebf9959dc160ea09ff663f614
Author: Paul Tiplady <paultiplady@gmail.com>
Date:   Sat Mar 22 18:07:42 2014 -0700

    First test passing: Generating models with int or str fields.

commit 247db530e214f47e67ffcbf26f85a0c4d1ac6af2
Author: Paul Tiplady <paultiplady@gmail.com>
Date:   Sat Mar 22 17:04:41 2014 -0700

    Initial steps in refactoring.