add some documentation comma: make tail recursive, and make not split on comma when inside URIs implement expire/1, route/1, record_route/1 from, to, contact, cseq, callid: also accept a keylist as argument add test code for comma()
add some documentation
comma: make tail recursive, and make not split on comma when inside URIs
implement expire/1, route/1, record_route/1
from, to, contact, cseq, callid: also accept a keylist as argument
add test code for comma()

the above is committed for H�kan Stenholm <hsten@it.su.se>

Change build_header into build_header_binary. By building a binary instead
of a list, we achieved a 5.75x speed increase in building messages that are
going to be sent out on the wire.


git-svn-id: 3f662d0c7823f96a484d6a9a7c90f2d7866b6747@684 e454d3dc-12ff-0310-9b8b-94264392205f

bernardd/yxa,bernardd/yxa,bernardd/yxa,bernardd/yxa