First Sketch

- Skip redirect path to API
- Build out the overview page as a splash
- Build out map interactives on the landing to
illustrate higher level ideas to build wit MapBox
- Start putting overview groups into call out sections and
make copy edits
Merge branch 'gh-pages' into new-landing
Break out doc layout from the landing.

- Piece out sections that are more appropriate to the API docs from the landing.
- Methodize the site.defaultID string replacing
- Formatting, general copy editing
Merge branch 'gh-pages' into new-landing
Remove the community links + some little glitches
Drop in four examples
Create a deeper margin-bottom on sections clarifying sections better. Closes #542
Remove map id replacement
Group tabs to the interactive better. New splash copy
Merge branch 'gh-pages' into new-landing
Merge branch 'gh-pages' into new-landing

Conflicts:
	_config.gh-pages.yml
	_config.yml
Merge pull request #556 from mapbox/new-landing

New landing