Fix pidfile handling for Fedora

Patch contributed by Nikos Mavrogiannopoulos.
Move default debian pidfile from /var/run/sniproxy/sniproxy.pid to /var/run/sniproxy.pid, fix umask
Merge pull request #55 from dlundquist/pidfile

Pidfile
Merge branch 'master' into nonblocking-connect

Conflicts:
	.travis.yml