avoid overwriting QUnit.log methods

[leobalter]

On

grunt-saucelabs/examples/qunit/index.html

Lines 12 to 19 in b25ff61

	QUnit.testStart(function (testDetails) {
	QUnit.log = function (details) {
	if (!details.result) {
	details.name = testDetails.name;
	log.push(details);
	}
	};
	});

this could be replaced by:

    QUnit.log(function(details) {
        if (!details.result) {
          log.push(details);
        }
    });

Overwriting a callback method is not recommended on QUnit and you don't need the testStart callback to get the corresponding test name on current versions of QUnit. details.name will be provided it from the assertion log callback, and details.message will contain the assertion's message.

Ref: http://api.qunitjs.com/QUnit.log/