Updated the generator test to include yield*

The yield* keyword, as you know, successively yields values from the
given iterable until it's exhausted.

This also removes the "application/javascript;version=1.8" version of
the test, which actually didn't influence anything in Firefox w/r/t
this feature.

This test change doesn't alter any of the support results.
Merge pull request #210 from webbedspace/generators

Updated the generator test to include yield*