Initial work on in-browser test runner

Run `grunt test` and open up the `build/test/index.html` to run the
tests.

src/js/.eslintrc.json

@@ -109,6 +109,10 @@
         "OutputWaiter": false,
         "RecipeWaiter": false,
         "SeasonalWaiter": false,
-        "WindowWaiter": false
+        "WindowWaiter": false,
+
+        /* test */
+        "Vue": false,
+        "TestRegister": false
     }
-}
+}