Bug 898903 - Prevent env["PATH"] from becoming Unicode on Windows. r=jgriffin
Bug 890597 - Transport layer ping diagnostic tool. r=valentin.gosu
Bug 897404 - Port GTK2 to GTK3 - treeview rendering, expander fix. r=karlt
Bug 899460 - Remove MOZ_GTK_EXPANDER. r=karlt
Bug 897185 - toJSON only deals with attributes whose types are serializable. r=bz

Now jsonifiers only include serializable attributes in their returned object, as
per spec.