read a pid from file, and send signal up on request

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
print status at end

Unless the command is started as service.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
make daemon state to persist

Write the run state to the pid file.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
add manual page

Signed-off-by: Sami Kerola <kerolasa@iki.fi>