Started dev tests for rc_alerts_view_controller plus other changes detailed below.

- got a start on rc_alerts_view_controller tests

- Updated README to be more re;levant to this iteration of
UICatalogWithTests.

- assigned each of the alert objects to an attr_accessor to make it
easier to access them for testing purposes.

- Changed the alerts localized text to be more informative.

- Commented out some statements that were part of the alerts code
change; they will be removed with next commit.

- removed def controller from spec tests.