this adds the nice QUnit object differences to Batman.TestCase

So instead of "undefined" in the test failure, now you'll get a nice message!

PhantomJS 1.9 (Mac) EventTest strippedMessage will strip html entities FAILED
	"a scripdsfsdfdsft" expected but was "a script"
	    at /Users/ianquick/Code/Ruby/shopify/test/javascripts/lib/batman.testing.js:576
	    at /Users/ianquick/Code/Ruby/shopify/test/javascripts/lib/batman.testing.js:6472
	    at /Users/ianquick/Code/Ruby/shopify/test/javascripts/unit/admin/event_test.js.coffee-compiled.js:26
	    at /Users/ianquick/Code/Ruby/shopify/test/javascripts/lib/sinon.js:3987
	    at /Users/ianquick/Code/Ruby/shopify/test/javascripts/lib/es5-shim.js:142
	    at /Users/ianquick/Code/Ruby/shopify/test/javascripts/lib/batman.testing.js:188
	    at /Users/ianquick/Code/Ruby/shopify/test/javascripts/lib/batman.testing.js:347
	    at process (/Users/ianquick/Code/Ruby/shopify/test/javascripts/lib/batman.testing.js:1390)
	    at next (/Users/ianquick/Code/Ruby/shopify/test/javascripts/lib/batman.testing.js:1383)
	    at wrapped (/Users/ianquick/Code/Ruby/shopify/app/assets/batman/admin2/vendor/tracekit.js:51)