Replace Django hashcompat with hashlib

This fixes a DeprecationWarning in Django 1.5, which recommends
no longer using django.utils.hashcompat.
Replace Django Hashcompat with Hashlib
Merge pull request #47 from stockr-labs/feature#hashlib

Replaces Django Hashcompat with Hashlib
Merge branch 'master' of git://github.com/DrMeers/django-avatar into DrMeers-master

Conflicts:
	avatar/models.py
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.
Merge pull request #58 from Kami/django_1.6_compatibility_fixes

Django 1.6 compatibility fixes
Fixed setup.py.
Revamped tests and added Travis config.
Merge branch 'master' of github.com:jezdez/django-avatar

Conflicts:
	avatar/urls.py
	tests/settings.py
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.