V4 dev style update

This PR consists of:
- A style overhaul well-tested on iPhone 5, iPad 3 and Desktop in Chrome and Safari.
- Lots of CSS deleted, lots added.
- Typography. I'm including my personal Typekit CDN to load the web fonts.
- Markup changes on all views. The data attributes of form input should be consistent though.

This PR does not include:
- Routes corresponding to these views are not included.
- Significant changes to the copy. That is the primary outstanding task for v4.
- Page transitions. I will create a new feature branch for that implementation.