Update to the ORTC API

Most of the ORCA CG contributions to date are included in this recent
update to the ORTC API.

http://ortc.org/wp-content/uploads/2014/02/ortc.html

As a reminder, we will be holding a CG meeting on February 20, 10am
Pacific. The details are on the ORCA CG page:

http://www.w3.org/community/orca/2014/02/13/our-first-orca-cg-meeting/

/Erik