quiet option for spork server

[debreczeni]

This adds a very simple quiet option for launching spork server to omit the "Running tests with args #{argv.inspect}..." and "Done.\n\n"

at the command line:

    spork --quiet
    spork -q

Mostly useful with guard-spork to help having better output in the terminal
Here's the related pull request that allows a quiet option to be specified on guard-spork:
guard/guard-spork#58

[arronmabrey]

Hey guys any chance of pulling this in?

[mikesmullin]

+1 for this. very annoying without it
http://i.imgur.com/MnQl0.png

[thibaudgg]

@debreczeni maybe it would be merged quicker if you add some specs :)

[timcharper]

Yes, a simple test somewhere would be helpful, but sounds like there is a lot of pain here, and this one slipped past my radar. I'll go ahead and merge it.

(you know you could use grep -v to filter output, right?)

[thibaudgg]

Great, thanks for merge! (sorry I didn't know for grep -v, shame on me!)