Issue47 service restart

resolves #47 
LogSearchShipper should be a "start and expect to continue to work forever" service.

So, I think that in the event of a crash of nxlog, we should restart after 60 seconds continuously as long as LogSearchShipper is running.

I guess this means that nxlog should be set to restart under any conditions; since when LogSearchShipper wants to "stop" nxlog, it will de-register the nxlog service.