Adding changes from train and flight back home from SIPit23 in Lannion, France.

- Additional comments on TCP/TLS implementation
- Some additions for new drafts/rfcs (no new functionality really, mostly documentation)
- Other random small fixes


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@151019 65c4cc65-6c06-0410-ace0-fbb531ad65f3