Fix post_processors being called when there're no resize_source_to
No need to import tests in __init__.py.
Added delete_thumbnails management command.
Merge pull request #56 from SeiryuZ/fix-resize-source-to

Fix post_processors being called when there're no resize_source_to
Changed Thumbnail and FallbackImage url to be a property
Renamed "BASEDIR" to "BASE_DIR".
Renamed "Gallery" to "ThumbnailManager".
Removed reference to "BASE_DIR" in test_fields.py
PEP 8 fixes.
Merge pull request #57 from SeiryuZ/change-url-to-property

Changed Thumbnail and FallbackImage url to be a property
Updated README.
Version 0.1.0
Minor README fixes.
Use **kwargs to pass parameters into processors