libpanel-applet: unown bus name and unregister dbus object

https://bugzilla.gnome.org/show_bug.cgi?id=692610
misc: remove Jonathan from maintainers
libpanel-applet: update version

- Update API version to 5.0.
- Don't use version number in library name.
- Rename from libpanelapplet-4.0.pc to libpanel-applet.pc.
- Reset library version info to 0:0:0.
remove MAINTAINERS file
misc: update POTFILES.in
libpanel-applet: update documentation
clock: fix libpanel-util/panel-color.h include
libpanel-applet: update girdir and typelibdir
doap: add programming-language
doap: update name
doap: update mailing-list
fish: Fix a memory leak
theme: add css style for Adwaita theme

This is same style that used to live in gnome-themes-standard.
clock: fix weather preferences
menu.c: force pixel size for menu item images

Get pixel size from GtkIconSize and use it to force size for
images in menu items.
fish: restore option to change animation
fish: update fish widget after it is setup
fish: use G_DEFINE_TYPE
bump version to 3.10.0
improve Adwaita theme