Try to simplify setting up the example project.
made compatible with Django Storage API and Amazon AWS S3
removed unused imports
Moved ImageModel save() date_taken code back. Added ImageModelFactory.
Added boto and django-storages to example_project requirements.txt.
Convert PIL Images to Django Files so S3 gets Content-Type correct.
Changed StringIO.StringIO to io.BytesIO.
File not required.
Merge remote-tracking branch 'Celiao/master' into s3
Rejig how S3 is presented in the example project.
Document using S3.
Merge branch 's3' into photologue3.0

Conflicts:
	example_project/example_project/settings.py