[AppStream] appstream-glib 0.5.12

[Richard Hughes]

Version 0.5.12
~~~~~~~~~~~~~~
Released: 2016-03-29

New Features:
 - Add a merge-appstream command to appstream-util
 - Add as_app_get_id_no_prefix()
 - Add as_app_has_compulsory_for_desktop()
 - Add AS_APP_QUIRK_MATCH_ANY_PREFIX
 - Add as_store_get_app_by_id_ignore_prefix()
 - Add as_store_get_apps_by_id()
 - Add support for content ratings

Bugfixes:
 - Split up AudioVideo into two categories

Richard