Django-b2

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* !! new B2_LOCAL_MEDIA setting was in 0.3.0 named incompatible as B2_LOCAL_CACHE="FM"
* B2_LOCAL_MEDIA setting to make a local copy of files. So you can have local instances backuped on backblaze.
* B2_LOCAL_MEDIA prevents failures if the django application want immediately reopen the file (imagekits creating thumbnails, Wagtail is an example)

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* backblaze_b2.py can be called as script to upload single file.
* pgtob2.sh script to backup postgres database

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* No code change. Minor docs changes.

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* First release on PyPI.