Log Message:
mate-terminal: update to 1.22

### mate-terminal 1.22.0

  * Translations update
  * Initialize Travis CI support
  * Remove unused files in help dir
  * Remove generated files
  * Add update-authors.pl which helps to update terminal.about
  * Update authors
  * Update Documenters
  * drop umtp suport
  * Help - Window title when MATE Terminal is started for first time
  * Help - alternative text for tabbed window picture
  * Help - TERM=xterm-256color
  * eggsmclient: avoid deprecated 'g_type_class_add_private'
  * src/terminal-screen.c: Set TERM to 'xterm-256color' (instead of just 'xterm').
  * move appdata to metainfo directory