New Browse

First stab at new browse. There are still things to do to make it work correctly but this is a first pass at getting it work. As it doesn't register routes it can't be seen in production but we will be able to manually force preview to show it so we can start testing it.

https://www.pivotaltracker.com/story/show/72442208
I don't have examples, just been burnt a few times by overwriting the prototype and then having problems when working with that same prototype in other files.

I was asking to flag it as a potential problem but if you're not going to use it in that way then it's not an issue.