seperate jingle and gtalk so it will be easier to track

changes in both of the moving specs.  Currently chan_gtalk is 
compatible with the latest gtalk/libjingle version, and chan_jingle
needs a lot of work.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@43185 65c4cc65-6c06-0410-ace0-fbb531ad65f3