Django-awl

* added "follow=False" keyword to AdminToolsMixin.authed_get()

* improved KeyError handling in the accessor template tag

* made django-awl compatible with Django 1.9
* separated models and abstract models to avoid deprecation warnings in Django 1.9
* even if only loading an abstract model from models.py the module gets
loaded and django sees the concrete models in the file which aren't in
INSTALLED_APPS and issues a warning
* now only concrete models are in models.py and the abstract ones are in
absmodel.spy

* added css_colours module, tests for values that are valid CSS colours

* fixed getitem template filter so that it handles key errors silently

* added "as" syntax to accessor templatetag