fix typos in gtype. ref #42
cleanup gtype macro implemenations (remove line numbers)
add start/stop for GtkSpinner
Add constructor for GtkAdjustment from GtkSpinButton
Add very limited support for tree view
use convert to extract child elements which may already have a julia object
Improved GtkTreeView based on Jamesons suggestions
use push/unshift instead of pack_start/end
some further fixes to TreeView code
allow creating a GValue containing a GType (typically translated from a Julia type)
Merge branch 'listView' of github.com:tknopp/Gtk.jl into tknopp-listView

Conflicts:
	src/Gtk.jl
add auto-gen accessors for GtkTreeView