improvements to the test suite

[g]

I have made changes to the test runner. 

Now it is possible to specify the javascript console to use from the command line using the -j or --js-exec command line option... ie --js-exec d8 or -j "/path/ to /d8"

I have also added an option (-q or --qunit) to output QUnit tests for testing browser compatibility.  Eventually it would be nice to use something like https://github.com/jquery/testswarm/

Changes here: https://github.com/thenewguy/pyjaco/tree/gordon-devel