trakio: port test to new api

/cc @ianstormtaylor there are two tests not passing, any ideas? I also had to add `window.trak.push = window.trak.push || function(){}` because of when we're reinitializing in the tests, but not reloading, the real `window.trak` object doesn't have a push method, so it fails.

```
should prefer a name ‣
Error: Expected "stub" to be called with "[
  null,
  "name"
]", 
but it was called with "[
  "/",
  "name"
]".
    at module.exports.exports (http://localhost:4202/build/build.js:260:9)
    at Analytics.analytics.called (http://localhost:4202/build/build.js:21464:5)
    at Context.<anonymous> (http://localhost:4202/build/build.js:11108:19)
    at Test.Runnable.run (http://localhost:4202/test/mocha.js:4212:32)
    at Runner.runTest (http://localhost:4202/test/mocha.js:4584:10)
    at http://localhost:4202/test/mocha.js:4630:12
    at next (http://localhost:4202/test/mocha.js:4510:14)
    at http://localhost:4202/test/mocha.js:4519:7
    at next (http://localhost:4202/test/mocha.js:4463:23)
    at http://localhost:4202/test/mocha.js:4482:7
```

```
should prefer a category and name ‣
Error: Expected "stub" to be called with "[
  null,
  "category name"
]", 
but it was called with "[
  "/",
  "category name"
]".
    at module.exports.exports (http://localhost:4202/build/build.js:260:9)
    at Analytics.analytics.called (http://localhost:4202/build/build.js:21464:5)
    at Context.<anonymous> (http://localhost:4202/build/build.js:11113:19)
    at Test.Runnable.run (http://localhost:4202/test/mocha.js:4212:32)
    at Runner.runTest (http://localhost:4202/test/mocha.js:4584:10)
    at http://localhost:4202/test/mocha.js:4630:12
    at next (http://localhost:4202/test/mocha.js:4510:14)
    at http://localhost:4202/test/mocha.js:4519:7
    at next (http://localhost:4202/test/mocha.js:4463:23)
    at http://localhost:4202/test/mocha.js:4482:7
```
no need to do `null, null` here because `analytics.page()` the name/category are optional, we only needed to do that with the older tester