[PATCH] python: add bindings for notmuch_message_get_propert(y/ies)

[David Bremner]

Ruben Pollan <meskio at sindominio.net> writes:

> Message.get_property (prop) returns a string with the value of the property and
> Message.get_properties (prop, exact=False) yields key, value pairs

pushed this version to master.  Thanks for your contribution.

d