Fixes to make sure all editors actually work

Hi,

I've went through the `test_project` and fixed every issue I found with initializing/enabling and disabling editors. It turned out there were still some bugs:

- CKEditor/TinyMCE/Redactor worked with the JavaScript API, but didn't work with `{% wysiwyg_setup %}`.
- TinyMCE didn't disable properly

This should fix the remaining issues of #28

A few other minor issues are fixed too:
- `setup.py` didn't exclude the `test_project` properly.
- Enabled inline popups for TinyMCE
- Made the test project work with Django 1.4 too.

I'm looking forward to get this merged, and have a new release out! :)