Changed to temporary namespaces to match with latest XEPs. As soon as

Jingle is completely standardized, we can set those namespaces to their
final values.

Added two attributes to the jingle_pvt struct to store the content
name attributes. Reported by Robert McQueen on Telepathy's framework
mailing list :
http://lists.freedesktop.org/archives/telepathy/2008-May/001971.html

Keeping working on our Jingle stack!

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@118644 65c4cc65-6c06-0410-ace0-fbb531ad65f3