A new look

I've done some preliminary work on getting the CSS to look a bit better, but there's quite a bit more to go. Some things to look into:

- the Foundation grid structure: I'm unfamiliar with Foundation and the way it does grids (I've used more Bootstrap in the past). I'm using a 7-5 column layout, but for some reason, there is some padding in the middle and I'm fighting the width percentages a bit. I'm aiming to make this as responsive as possible.

- the Gistify and Save buttons: Don't know where to put those...

- Cleaning up of the NavBar: I changed a bunch of stuff, but maybe some further work needs to be done. Under preferences, I'd like to be able to have the user set the editor style there + do a few other things.

- I think I may have broken something when it comes to running the Ruby code, though it may just be because I'm working locally. Didn't touch much Ruby in this branch thus yet.

Could definitely use a hand in fixing a few of these things :)

(also, I added some ricepaper... feel free to delete or find something else... mainly put it there as placeholder)