Fix refreshing an already running app in iOS Simulator
Fixes http://teampulse.telerik.com/view#item/274387

kill all instances of running launcherd_sim to stop the running instances of the app.
use ios-sim with --exit parameter to ensure clean update

Return 500 to clients when there's an error receiving the app package file
Merge pull request #443 from Icenium/totev/emulateios

Fix refreshing an already running app in iOS Simulator