Improve the HighContrast icon
Update README and HACKING
release: pre-release version bump to 0.3.4
release: update NEWS
post release version bump to 0.3.5
Update HACKING
GI imports: require Gtk 3.0

We know we can not operate with Gtk 2.0 introspected libraries, so
let's not even try to load them (in case the user does not have
Gtk-3.0.typelib installed).

https://bugzilla.gnome.org/show_bug.cgi?id=700163
Require gobject introspection >= 0.9.6
Use dbus_is_address() instead of dbus_is_supported_address()
Use GTestDBus instead of Systembus and Sessionbus
Updated POTFILES.in and POTFILES.skip
Remove unneeded context from strings
Add empty (for now) LINGUAS file to satisfy Damned Lies
Removed markup from Ui files. See https://live.gnome.org/GnomeGoals/RemoveMarkupInMessages
Added Spanish language lo LINGUAS
Updated Spanish translation
Added Slovenian translation
Added sl for Slovenian translation