Piwik

still need to add some mapping to the ui, this also removes `.assumesPageview()` that disabled page views unfortunately.

![screen shot 2014-05-29 at 2 32 07 am](https://cloud.githubusercontent.com/assets/1661587/3112376/4e943218-e6c0-11e3-82d4-68cc05ec02a7.png)

cc @DirtyAnalytics