Add Foundation 4 for some basic styling

Not sure if this project is still alive, but I added some styling for my own perusal through the calculator. Thought I would make it available in case you wanted it to have a bit of style on initial cloning.

Also, curious what your direction was on the project. I have another commit in the works to make it deployable: I was thinking of hosting it on Heroku for usage amongst my fellow Persona-playing friends, but if you'd like to host the *official* version of it, I'll send another PR your way and you can host it. 

Let me know what you think - my email is on my Github profile if that works better. Cheers!