Build & deployment improvements

Update basic scaling test to it now:
- creates an app
- validates the gear registry contents
- verifies the <title> retrieved from /
- scales up to 2
- verifies <title> from both gears
- modifies the <title> and pushes the change
- verifies <title> was updated on both gears
- scales to 3
- verifies <title> is still updated on all 3
- issues rollback
- verifies <title> matches rolled back version