Merge pull request #349 from 18F/gboone-pif

Fellows page, updated data files
added links to fellow rounds, pif logo
Big update,

- PIF projects and fellows are now both data we can pull in any part of the
  site and expose with a JSON endpoint.
- Project rounds can be generated by adding the content to the
  projects.yaml file, creating an html template and including the
`list.html` file in the `pages/pif/projects` directory.
Merge branch 'gboone-pif' of github.com:18F/18f.gsa.gov into gboone-pif