Common components for the dashboard

I would have loved to clean this up better, but for now there is just no time... and I want you guys to use it.

Included:

* Brand new side bar! Only one real level so far, second "faked" level possible for demo. (More below)
* Rejuvenated navigation bar. (Changes according to current wrapper, new search bar)
* Better wrapping of the different routes with regards to their purpose, but also in general.

Things I would have liked to do:

* Start to organize LESS a little, perhaps in some sub-files, I have an idea for the organization.
* Create a Router-ready component for the navigation bar drop-down menus like we did for the single menu items.
* Proper sidebar item nesting and collapsing.
* Investigate an input add-on button workaround or implement the functionality.
* Tinker the structure and disposition of the potential sidebar buttons properly.
I don't think you're allowed to self-close an <i> tag, unless React "fixes" it and I don't know.