Merge pull request #318 from mapbox/staging

update default layout
Updating default to shareship latest
Bring new Docs() back to life and add a version tag to the heading. Closes #321
updated footer
Update default layout.
Updating default.html
update default.html
update default.html
Merge pull request #323 from mapbox/newmast

Updating default.html
Updated _layouts/default.html
Updated _layouts/default.html
Stage re-template default.html