Log Message:
mate-control-center: update to 1.22

### mate-control-center 1.22.0

  * Translations update
  * Initialize travis support
  * eggcellrendererkeys: avoid deprecated 'gtk_widget_modify_bg/fg'
  * Update MCC help
  * default-applications: Use more common icon names for Office documents
  * mate-display-properties: Migrate from dbus-glib to GDBus
  * Fix the runtime warning about gtk_widget_destroy.
  * Fixed number of cols error after reload menus.
  * Fixed crash when install/remove application.
  * capplets/mouse: .svg files instead .png in doubleclick artwork
  * capplets/mouse: New doubleclick artwork with mate logo
  * disable deprecation warnings for distcheck
  * default-applications: Fix assertion failture on g_icon_to_string
  * default-applications: Add a widget for a default calculator application
  * default-applications: Use the selected word processor for RTF as well