gplugin/gplugin

merge these diverged branches together
feature/gtk-doc
2018-05-07, Gary Kramlich
d92f986ed621
merge these diverged branches together
usr/include/gplugin-1.0/gplugin-gtk
usr/include/gplugin-1.0/gplugin-gtk.h
debian/tmp/usr/lib/*/libgplugin-gtk.so
debian/tmp/usr/lib/*/pkgconfig/gplugin-gtk.pc