Simplekv

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* Fix support for ``key in store`` for azure with ``azure-storage-blob`` 12

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* Add support for ``azure-storage-blob`` version 12. (``azure-storage-blob`` version 2 is still supported.)

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* Add the optional parameters of the Azure API max_block_size and max_single_put_size to the AzureBlockBlobStore.

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* Add ``iter_prefixes()`` method to iterate over all prefixes currently in the store, in any order. The
prefixes are listed up to the given delimiter.

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* Use ``BlockBlobService.list_blob_names`` in :meth:`simplekv.net.azurestore.AzureBlockBlobStore.iter_keys``.
This will only parse the names from Azure's XML response thus reducing CPU time
siginificantly for this function.
* They ``.keys()`` method on Python 3 now returns a list. This is in line with the documentation and the
behaviour on Python 2. It used to return a generator.

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* Fix file-descriptor leak in `KeyValueStore._get_file`