Replaced django.conf.urls.defaults by django.conf.urls to suppress warning
prevents crash when deleting user with attached avatars (fixes #52)
changed some form label names
dispatch avatar_updated signal from admin as well
Update url configs.

django.conf.urls.defaults has been deprecated and now fully removed in 1.6.
Fixed setup.py.
Revamped tests and added Travis config.
Fixed some Python 3 bug.
More Python 3 fixes.
Use six.StringIO.
Use new test method names.
Use Python 3 compat import location for urlparse.
Use storage file directly.
Use integer sizes.
More Python 3 fixes.
Use str just in case.
Add travis image.
Bump version up a notch.
Add description.
Use PIL.Image.