Include chai-jquery in the test infrastructure, and translate jQuery =
Zepto in the test index.html, so chai-jquery works with zepto underneath.

There may be a less broad way to get chai-jquery zepto compatibility, but
this is simple and seems to work.
One example that uses chai-jquery '.should.have.class()'.
Even better - undo the assignment of 'jQuery' to 'Zepto' after chai-jquery
is loaded, so the fancy footwork won't affect anything else.
Merge pull request #21 from SpiderOak/more-testing-enhancements

More testing enhancements