Block all clickable elements while automation specs are running

Issue #533

Reviewed By: Sergey Golod <sgolod@rim.com>
Tested By: Sergey Golod <sgolod@rim.com>
Kill deploy-automation 20 seconds after starting agents.

Issue #529

Reviewed By: Hasan Ahmad <haahmad@rim.com>
Tested By: Hasan Ahmad <haahmad@rim.com>