Correct error in nksip_registrar
Add case for "*" in nksip_parse_uri
Correct error in nksip_parse_tokens
Fix several problems in parser

- Calculation of content length for udp and sctp
- Allow Max-Forwards = 0
- Do not offer error responses for SIP responses
Several tests fixes
Dialyzer updates
Fix error in parsing of auth headers
UDP transport tries again if port is busy
Fix ipv6_test in linux

For some reason, ranch fails using ip "::" (0:0:0:0:0:0:0:0) in Linux, it works in OSX