Passes spec if any version of PhantomJS is found in the launchers. (fixes #377)

This spec was failing on my development machine because the version of
PhantomJS installed (1.6.0) didn't match the version hard-coded in the
assertion (1.9.0).

The fix was to make the test assert that any version of PhantomJS is
included, by matching the regex /^PhantomJS \d/.