Update to 1.09

Upstream changes:
1.09 2012-08-10

* Multiple bug fixes concerning filters, including empty filters,
  valueless keys, and applying filters to single values.
* Add "human" argument to get_all and get_regexp, to match get
* Add an add_comment method
* Add an encoding attribute, which adds the appropriate layer on file
  I/O
* Enforce that all keys must have sections, as git 1.7.4.4 began doing

1.08 2012-02-15

* Fix loading of user_file, broken in dcdd01f, due to unexpanded ~
  (alexmv, clkao@clkao.org)

(wen)