jquery.plugin.html2canvas: add profiling option, tests: enable profiling

in case you run the tests in firefox and have firebug installed and
active you now get a profiling run of html2canvas ;)

tests/test.js

@@ -18,8 +18,9 @@
     }
     setTimeout(function() {
       $(document.body).html2canvas({
-        logging: true
+        logging: true,
+        profile: true
       });
     }, 100);
   };
-}(document, window));
+}(document, window));