Added simple image processors

1. Added utility function import attribute
2. Reworked create_thumbnails to process image through processors
3. finished basic processors resize
Refactored File and Conf.py

1. Import procesors functions directly in conf.py
2. Reworked on how the file should be saved, No temporary file
3. Reworked on how Image file should be read from storage
4. Added more basic processors
Refactor file.py and processors.py

1. Reworked saving file to use StringIO instead of temporary file
2. Deleted processors scale and added crop processors
3. Updated README
Make saving thumbnail compatible with python3

1. Changed StringIO to io.BytesIO
2. Simplify the process of getting the processors
Processors now return image
temporary
Allow custom path for thumbnail creation

1. Added settings to generate thumbnails in user defined basedirs
Make BASEDIR settings inside THUMBNAILS key
Refactored conf, file and settings

1. Make processors definition accept both list and tuple
2. Deleted unused self._thumbnails on ThumbnailedImageFile
3. Fixed comments on Galler.all
4. Renamed function purge_thumbnails_cache -> purge_all_thumbnails_cache
5. Added settings for processors with tuple to test .1
Merge pull request #12 from jessicarasidi/master

init for RedisBackend
Updated README and removed unused grayscale processors
Added default basedir
Merge pull request #13 from SeiryuZ/thumbnail-folder

Allow custom path for thumbnail creation
Allow source image to be passed to processors

1. Modified conf.py to set empty list to size_dict where processors are
not defined
2. Allow the field to accept resize arguments and process the source
image
3. Refactor process_image into its own function
thumbnails.utils.process_Image
Merge remote-tracking branch 'origin/master' into processors
Merge branch 'master' of github.com:ui/django-thumbnails into processors

Conflicts:
	thumbnails/conf.py
	thumbnails/tests/fields.py
Refactored processors

1. Moved thumbnails.utils.process_image thumbnails.processors.process
2. Renamed resize argument for the field to resize_original
Merge pull request #9 from SeiryuZ/processors

Added simple image processors