add purpose statement and props - very early draft of spec

I was doing some research on grid systems and I began to think it would be dumb to try and pick the "right" way. JS is so much more flexible than CSS that it doesn't make sense to force one way of laying something out.

I think we should have some default - port over bootstrap and some other popular grids and then let people plug-and-play with whichever layout styling suits them. Don't like any? Write your own mixin and pass it in.

@rovolution this is a project @mcwhittemore and I were talking about tonight that basically allows for an easy-to-use but robust grid/layout system for React. It's intended to be used page-wide. Love your input/contributions.