Django-azure-storage

- Fix `CDN_HOST` setting to serve as the hostname and not the full path
- Switch to generating the blob urls with `BlobService.make_blob_url`

- Updated to [Azure Storage SDK](https://github.com/Azure/azure-storage-python) [version 0.20.3](https://github.com/Azure/azure-storage-python/releases/tag/v0.20.3) [https://github.com/Rediker-Software/django-azure-storage/commit/48546cc949afbac3bface6de1144aea6c38ce5d4, https://github.com/Rediker-Software/django-azure-storage/commit/264e522539f7df0743c1724ad69a83495055d78b]
- Added support for a custom CDN host [https://github.com/Rediker-Software/django-azure-storage/commit/70822b089c586e76647b79dec506d9a45e21e78d, https://github.com/Rediker-Software/django-azure-storage/commit/93b1cf80d903165dbaf8ffcc33dadaf98af141d3]
- Support uploading and retrieving files > 64MB [https://github.com/Rediker-Software/django-azure-storage/commit/4ef91c5fb7b521a73328b8255ef95cf1248110e0, https://github.com/Rediker-Software/django-azure-storage/commit/4f047eb4d1d91c4f897efbca86813ece1b507200]

- This pins the `azure` version number to before 1.0.0

This is here to fix the current issue of the latest Azure release, and allows us to start working on 3.

- Django 1.7 and 1.8 support in migrations [https://github.com/Rediker-Software/django-azure-storage/pull/2]

- Python 3 support

- Initial support
- Python 2.6/2.7 and Django 1.3+ compatibility