Determine if there is a better way to perform datastore.connection.Connection.delete_entity with the API

[dhermes]

From TODO:

    # TODO: Is this the right way to handle deleting
    #       (single and multiple as separate methods)?

See datastore.connection.Connection.delete_entity for relevant code and #146 for some context.

git blame output

dec0e7c6 (JJ Geewax 2014-01-28 15:15:40 -0500 387)     # TODO: Is this the right way to handle deleting

[tseaver]

I think we could safely drop 'delete_entity' from the Connection API: the 'Entity.delete' implementation could just as well delegate to 'Connection.delete_entities'.