Added grunt to project.

Move from embedded "fork" of jsHint to using grunt's jsHint module.
Cleaned ALL jsHint errors.
Added jasmine.util.isUndefined as alternative to extra careful protection against undefined clobbering

spec/node_performance_suite.js

@@ -2,10 +2,6 @@ var fs = require('fs');
 var util = require('util');
 var path = require('path');
 
-// yes, really keep this here to keep us honest, but only for jasmine's own runner! [xw]
-// undefined = "diz be undefined yo";
-
-
 var jasmineGlobals = require('../lib/jasmine-core/jasmine.js');
 for (var k in jasmineGlobals) {
   global[k] = jasmineGlobals[k];