Merge pull request #16 from GuillaumeGomez/master

New widget : ColorChooserDialog
Merge pull request #17 from GuillaumeGomez/master

New widget : MessageDialog
begin work on glibs list types
add List, more trait impls on List + SList
remove warning from test file
Merge pull request #18 from jeremyletang/glib-lists

Glib lists
add notebook layout
add Stack container
add StackSwitcher
add Revealer container
add Overlay container
add Scrollable trait + Layout container
add HeaderBar
add FlowBox + FlowBoxChild
add ActionBar
add ListBox + ListBoxRow
Merge pull request #20 from jeremyletang/layout-container

add layouts and containers
Merging
Merge remote-tracking branch 'upstream/master'

Conflicts:
	gtk_glue/gtk_glue.c
	src/glib/ffi.rs
	src/glib/list.rs
	src/glib/mod.rs
	src/glib/slist.rs
	src/gtk/cast.rs
	src/gtk/enums.rs
	src/gtk/ffi.rs
	src/gtk/mod.rs
	src/gtk/traits/mod.rs
	src/gtk/widgets/mod.rs
	src/rgtk.rs