Fix bug in TempFilesStorage for Django 1.6
Refactor testing to use Nose.
Version bump to 0.8.0
Resolved Issue OSP-19: Add Django 1.6 Support

django-assetfiles is broken with Django 1.6 - seems like they changed so
me of the File storage internals.

Subcommit(s):
  398ae28 Version bump to 0.8.0
  a9fdcc5 Refactor testing to use Nose.
  64ec6b4 Fix bug in TempFilesStorage for Django 1.6