Moving nested 'storage.acl.ACL.Entity' to module scope.
Test *real* ctor defaults.

Rather than those for testcase's '_makeOne'.
Add namespace to query ctor / clone.
Typos.
Pass namespace when fetching results.

Fixes #170.
Make '_get_protobuf_attribute_and_value' rigorous about bytes vs. text.
Make '_get_value_from_value_pb' rigorous about bytes vs. text.
Add notes to docstrings about 'text' vs. 'bytes' semantics.

Addresses #233.
Merge pull request #264 from dhermes/remove-nested-class-def

Moving nested 'storage.acl.ACL.Entity' to module scope.
Merge pull request #255 from tseaver/170-query_namespaces

Fix #170:  handle namespaces in queries
Merge pull request #263 from tseaver/233-support_blob_value

Address #233: support blob_value in protobuf