Update README with thumbnail_field
Thumbnail field in test models
Set branch to master for Travis
Update readme
Better code formatting in readme
Oh well
Get the thumbnail cache field from model instance
.
Save thumbnail in custom field
Merge branch 'master' of github.com:mattack108/djcroco into thumbnail-field

Conflicts:
	README.rst
Add Pillow for travis cli
Add tests
Merge pull request #10 from mattack108/thumbnail-field

Custom field for caching thumbnails