More robust host or IP determination
Ignore SIGHUP during peering fork

otherwise, the peers will be killed via SIGHUP at the completion of murder:peer if
Net::SSH is requested to provide a pseudo-tty via the capistrano option
default_run_options[:pty] = true
Misc bug fixes:

- fix race condition between screen starting and sh issuing a SIGHUP in murder:start_seeder
- fix my CAPISTANO typo
- prevent pkill from killing itself