Implemented basic from Vala's examples. Implemented set_window_position. Part of issue #32.
Added set_window_position to gtktest.
Removed some commented out code.
Part of issue #32
Added Range trait.
Scale now implements Range trait.
Added sync_widgets example from Vala example docs.
Part of issue #32
Merge pull request #58 from bpbp-boop/master

Start implementing examples from Vala's GTKSample guide.