Dtool-azure

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Fixed
^^^^^

Fixed Azure package problems.

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Added support for tags.

Added
^^^^^

- Added ``dtool_azure.storagebroker.AzureStorageBroker.delete_key()`` method
- Added ``dtool_azure.storagebroker.AzureStorageBroker.get_tag_key()`` method
- Added ``dtool_azure.storagebroker.AzureStorageBroker.list_tags()`` method

Fixed
^^^^^

- Made
``dtool_azure.storagebroker.AzureStorageBroker.list_dataset_uris``
more robust in cases where there is a container without metadata

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Added
^^^^^

- Added support for dataset annotations

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Added
^^^^^

- Added optimisation to improve speed when copying data from Azure storage

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Changed
^^^^^^^

- Cache environment variable changed from DTOOL_AZURE_CACHE_DIRECTORY to DTOOL_CACHE_DIRECTORY
- Default cache directory changed from ``~/.cache/dtool/azure`` to ``~/.cache/dtool``

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Fixed
^^^^^

- Generation of md5 checksums for large files, previously set to "None"