[empathy] (10 commits) ...Merge branch 'muc-password'

[Jonny Lamb <jonnylamb src gnome org>]

Summary of changes:

  a8e2927... keyring: rename current functions to be more specifically a
  1cbcfd3... keyring: add is_available function
  0bc660b... keyring: add get_room_password_{async,finish} functions
  4da8f83... chat: try to use a room password from the keyring or offer 
  cfab694... keyring: fix typo
  2e70e2f... keyring: add set_room_password functions
  935d2f6... chat: save room passwords in the keyring if requested
  267fb72... utils: add the _finish macros from wocky
  b03dfef... keyring: use the recently added finish macros
  38a7c55... Merge branch 'muc-password'