Initial commit of 7guis code, during budhac
add progress bar widget and Timer.hs example
remove comment
Merge branch 'master' into 7guis

Conflicts:
	src/LGtk.hs
	src/LGtk/Backend/Gtk.hs
Merge branch '7guis'
delete duplicate demos
move demos
update timer
refactoring
update flight booker (work in progress)