Type strings character-by-character on iOS 7. (refs #132)

UIAutomation intermittently fails to type characters (incorrectly capitalizing them,
skipping them, or throwing an exception).
Delay for a significant interval before attempting to tap a keyboard key when testing.
(fixes #132)

Tapping this key does not register sometimes on Travis; the long delay will hopefully
ensure that that key will be fully visible and tappable.
Merge pull request #133 from inkling/jeff/keyboard_test_fixes

iOS 7 keyboard fixes.