Fix java.lang.IllegalStateException: UiAutomationService not connected.

Fixes #675
Merge pull request #703 from bootstraponline/675

Fix java.lang.IllegalStateException: UiAutomationService not connected.
New session wins
Add test
add mock_ios device and rewrite session queueing unit tests
we don't use code so don't include it
Merge pull request #701 from bootstraponline/new_session_wins

New session wins
add basic test for android screenshot
add screenshot-in-sequence test