Fixing a few "stats-jobs" typos

As far as I can tell they should just all be stats-job
net.c:31:13: warning: Value stored to 'r' is never read
Copyright: 2013
Typo
adaptive epoll/kqueue timeout
fix crash from Conn use after free and double-free

fixes #159
don't over-specify the format of stats id field

Other stylistic changes.
show the delayed->ready transition via 'kick'

...as proposed in issue #172
Enable accepting connections over a local socket.

Allow a new source of incoming connections: AF_UNIX sockets.  Now connections
can be accepted from either regular TCP ports, local unix sockets or both
simultaneously.
Update man page to document the new -L option.