add URLOGRAPHER_INDEX_ALIAS with support in URLMapManager.cached_get
version 0.5
Simple admin for Content maps and Url maps
URLMap.delete() now deletes from cache as well
URLMap.hexdigest unique=True
Merge pull request #2 from renoc/master

Simple admin.py
refactor field validation, hex_digest setting and bring in assertRaisesMessage
Merge branch 'master' of github.com:ConsumerAffairs/django-urlographer
remove line that I accidentally left before commit
Merge branch 'master' of github.com:ConsumerAffairs/django-urlographer

Conflicts:
	urlographer/models.py
	urlographer/tests.py
fix test that broke with model validation changes
make hexdigest readonly and site a choice field when in admin