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

package.json

@@ -0,0 +1,7 @@
+{
+  "name": "jasmine-core",
+  "license": "MIT",
+  "devDependencies": {
+    "grunt-contrib-jshint": "~0.2.0"
+  }
+}