zip packaged apps asynchronously
pass ZipWriter error to async callback
Merge pull request #302 from mykmelez/async-zip

zip packaged apps asynchronously
prototype runApp command using mozApps.mgmt API
try to runApp after manual install/update/undo an app

NOTE: currently runApp doesn't always show the app when the simulator instance
is not already running, because the homescreen is not yet fully loaded and
the app will start in background (reachable by pressing the home button to reach
the gaia tasks list)
remove unnecessary binding
fix spacing  on simulator-actors