------------------------------------
* Fix migrations to run on MySQL
* Configurable content types with included JS/CSS requirements
* Updated message API to be compatible with Django 1.4+
* Updated template url syntax to be compatible with Django 1.5+
* Add missing CSRF token to attach form (see 38)
* Allow use of `{% render_content_area "by-slug-string" %}`
* Provide proper eTag and Last Modified checks to `edit_pagelet` view,
avoiding edits that get lost by overzealous caching
* Add `truncate_html_words` shim for Django 1.6+ compatibility
* Fix urls.py imports to work with Django 1.6+