update various network path docs
documenting some relay handling better, have to be more careful/strict
adding TCP path, and updating http
some extra details on paths/alts
fix language in bridge and also explain how it can be used in a peer/connect
tweak connect language on ip/port, and improve bridge too
some finishing touches based on feedback, merge time
Merge pull request #12 from telehash/netpaths

update various network path docs