Segment

Please review :)

We are currently tracking all route changes inside ember. This covers normal page views as well as ember's push-state URL changes. The five events in the story, https://www.pivotaltracker.com/story/show/80575808, are tracked server-side.

Questions:
- move all these analytics calls into one file? This would allow us to write one-liners in the rest of the code.
- any feedback on the event names? `event: 'Paper#updated (submitted=true)',`
- any other data you think we should be recording for any of these tracking calls?