Removing the file gtk.ruler.lisp
Work on the demos
Work on the GTK+ library
Updating the List of files
Work on the tutorial
Merge pull request #22 from monkey413/master

add gdk-pixbuf and gio into INSTALL file
Merge branch 'master' of github.com:crategus/cl-cffi-gtk

Correcting install desription.
Change gtk-switch-get-active to the generic function gtk-switch-active