Django-gaekit

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* Adds wagtail.wagtailimages integration tests
* Storage.open now raises IOError if file doesn't exist
* Storage.size now raises OSError if file doesn't exist

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* Adds support for retrieving file size

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* Remove dependency on ImageService. URLs are now constructed from bucket name, with no RPC calls.
* Resolved inconsistencies with returning bucket name as part of path. This is now hidden.
* Deprecated ImageService-specific options. IMAGESERVICE_DEFAULT_SIZE and IMAGESERVICE_SECURE_URLS.
* Deprecated drf_extensions module.

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* Break out options IMAGESERVICE_DEFAULT_SIZE, IMAGESERVICE_SECURE_URLS and IMAGESERVICE_UPLOAD_HEADERS

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* Duff release

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* Add FeedListKeyConstructor for drf_extensions