have pygobject pull from master and add pygobject2 tarball project

* pygobject 3.0 now parallel installs with pygobject 2.28
* pygobject 3.0 is introspection only
* pygobject 2.28 turns off introspection and is used to support the static
  bindings

https://bugzilla.gnome.org/show_bug.cgi?id=656400