Add missing ';'

Closes https://github.com/mate-desktop/marco/issues/149
Bump version to 1.9.3
Gtk3: Silence the GtkVBox and GtkHBox deprecations warnings
Replace gtkstock icon usage
merge metacity(gtk3) changes

merge metacity(gtk3) changes
fix warnings
clean up unused variables
replace UNUSED_VARIABLE by G_GNUC_UNUSED
wm-tester: correct NULL pointer check

Closes https://github.com/mate-desktop/marco/pull/144
compositor: fix possible dereference of NULL pointer

Closes https://github.com/mate-desktop/marco/pull/145
Merge remote-tracking branch 'upstream/master'

Conflicts:
	configure.ac
	src/tools/marco-window-demo.c
	src/ui/frames.c
	src/ui/preview-widget.c
	src/ui/tabpopup.c
	src/ui/theme.c