v0.7

New Features

• All new APIs are covered in the README file.

• Allow Map objects to be constructed from other mappings:
  Map(a=1), or Map([('a', 1)]), or Map(dict(a=1)).

• Implement Map.update() method.

• Implement Map.mutate() and MapMutation API.

• Make Map objects pickleable.

• Make Map.keys(), Map.values(), and Map.items() proper dict-view
  like objects.