Redesign

This pull request is a work in progress. Until it is merged, it will be live at http://gdcr.herokuapp.com/

## TODO List

- [x] Move to a consistent color scheme.
- [ ] Add a navigation bar fixed to the top of the screen (links to coderetreat.org, etc.)
- [ ] Pick out good fonts
- [ ] Re-style the map
    - [x] Change colors to match the colorscheme
    - [ ] Add city names so it's not as ambiguous where the event is
    - [ ] it would be great if clicking on a location gave information about it (see http://openhack.github.io/)
- [ ] Description and introduction to the Global Day of Coderetreat. Possibly include a summary coderetreat and a summary of the community’s goals and philosophy. **(this can be improved)**
- [ ] "Host a Coderetreat" section, button, or link, which leads visitors to a page with information about how to host a coderetreat for GDCR. Link to the Host and Facilitator Registration Form
- [ ] Global sponsor logos and links. Contractually obligated (this is one of the things we have promised to sponsors)
- [ ] Basic information about CoderDojo (sponsored organization)
- [ ] Count of the total number of cities **and projected number of participants**. Useful for attracting new sponsors
- [ ] Links to social media (Twitter, Facebook,Google Plus)
- [ ] Count-down to the day of the event
- [ ] Navigation links that go back to sections of coderetreat.org
    - @jthurne What specific pages would you like links to?