Update Ruby sample code.

Change from tag_name to class_name for u\_i\_catalog, simple\_test,
cucumber tests.

Changed to iOS 7.1 in u\_i\_catalog, simple\_test, cucumber tests.

Changed `capabilities` to `desired_caps` to avoid some weirdo
collisions.

Remove Debugging output from Cucumber.

Add example of send\_keys as an action chain for u\_i\_catalog.
Merge pull request #2230 from DylanLacey/examples_71

Update Ruby sample code.