configure: version back to unreleased
autogen.sh: Allow calling from out of tree

This is similar to the fix that was done for gstreamer

https://bugzilla.gnome.org/show_bug.cgi?id=667664
Merge pull request #1 from cablelabs/ruih/merge-2013-10-01

Ruih/merge 2013 10 01
Merge pull request #2 from cablelabs/ruih/master

Pull updates from ruih/master into cbl_master/plugfest36.