Add "quiet" flag

[hawkeyetwolf]

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I've set up an alias and script to automate the running of drush (drupal shell) commands, but the output from nanobox run is annoying. A -q flag would be grand, squelching this output:

Preparing environment :

multisite (local) :
  ✓ Restoring App
  Starting components :

Preparing environment :


      **
   *********
***************   Your command will run in an isolated Linux container
:: ********* ::   Code changes in either the container or desktop are mirrored
" ::: *** ::: "   ------------------------------------------------------------
  ""  :::  ""     If you run a server, access it at >> 172.21.0.2
    "" " ""
       "

RUNNING >

If I had any experience with Go, I'd make a PR. Maybe it's time to learn... Anywho, many thanks!