MVP UI design

**[Work in progress]**

@ianjorgensen Here is what I have so far. I finished:

- All the scaffolding (fonts, "core" styles, etc.)
- The "Login" page
- The layout for the "Main" page

I haven't touched the actual "uploads" list etc., so feel free to start looking there...

Flexbox requires some getting used too, but I'm quite happy with it. Just look at the `Login.less` file and see how easy it was for me to put the "remember/forgot" on the left, and the "login" button on the right. This article is really useful, and I strongly recommend it: http://css-tricks.com/snippets/css/a-guide-to-flexbox/

You can push directly to this branch, or create your own against it, whatever works best for you. I'll catch up with you tomorrow.

Thanks!