Django-gstorage

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- Read from local filesystem when file is not present on google cloud

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- ``gstorage.storage.Storage`` implements the interface expected from
``django.core.files.storage.Storage``. The only **supported interface**
at this point is ``storage._save``, and other methods are experimental.
- Support Python 3.4 for new Django (1.9 and 1.10)
- Added an example project showing use of django-gstorage

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- Updated docstrings to sphinx style
- Added documentation for gstorage.utils

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**Features**

- Refactored tests and added seperate test files for each module.
- Updated documentation on readthedocs.io to include section about
bucket.

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**Features**

- ``gstorage.bucket.Bucket.get_default`` allowing easy access to
default bucket.
- ``gstorage.bucket.Bucket.copydir`` allowing easy upload of files
to Google cloud.