Adds basic styling to app and lays groundwork for future styling

* Uses bourbon, neat, and bitters (though suspenders set up)
* Basic styling for buttons, titles, forms, and lists
why does your body have a class? I think you want to have something like this:

```
<html>
  <head>
  </head>
  <body>
    <div id="header">
    </div>
    <div id="content">
      <%= yield %>
    </div>
  </body>
</html>
```