Merge branch 'plugininstaller' into 'gtk3'

Plugin Installer Version 0.18

See merge request !24

plugin_installer/DST_Root_CA_X3.pem

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plugin_installer/manifest.ini

 [info]
 name: Plugin Installer
 short_name: plugin_installer
-version: 0.17
+version: 0.18
 description: Install and upgrade plugins from ftp
 authors: Denis Fomin <fominde@gmail.com>
  Yann Leboulanger <asterix@lagaule.org>
  Thilo Molitor <thilo@eightysoft.de>
-homepage: http://trac-plugins.gajim.org/wiki/PluginInstallerPlugin
+ Philipp Hörist <philipp@hoerist.com>
+homepage: https://dev.gajim.org/gajim/gajim-plugins/wikis/PluginInstallerPlugin
 min_gajim_version: 0.16.10