New document sidebar

This is the new redesigned sidebar UI for documents. The idea is that design doc functions will be first class citizens.

Screenshot:
![newsidebar](https://cloud.githubusercontent.com/assets/179458/3300201/37ceaa96-f61e-11e3-8375-276b17237660.png)

> I don't quite follow what you mean here? Do you want to add views.js as a dependancy to sidebarviews.js? 

Yes, what do you think about this approach?

Loading everything into one View Object reminds me that this could lead to `God Objects` and Global State plus dependency issues (`sidebarviews.js` which is a depenency of `views.js` must be loaded first, so that views.js has a Global Views-Object)