Includes some espresso tests to ensure that the proper
tab is selected when you attempt to launch settings.
Bug: 30233920
Change-Id: I171293114bd84b064b333091fcf2394d44debed5
(cherry picked from commit d1ef20beaa)
1. Split existing tests into fully automatable (unit/) and not fully
automatable (app/)
2. Revert previous changes to test runners on app/
3. Fix some typos in readme
This will enable us to add the fully automatable test target
SettingsUnitTests to the continuous integration tests on the platform.
Change-Id: I0f42c59fde84891e4bfc379150c2f0c61ce1329f