Automate ingesting Mapzen HTML templates

[dphiffer]

These files should get pulled in using the Makefile. There is some light sed work here to convert the incoming Jekyll templates into Smarty.

• https://github.com/mapzen/website/blob/master/_includes/navbar.html => https://github.com/whosonfirst/whosonfirst-www-api/blob/mapzen/www/templates/inc_head_navi_mapzen.txt
• https://github.com/mapzen/website/blob/master/_includes/footer.html => https://github.com/whosonfirst/whosonfirst-www-api/blob/mapzen/www/templates/inc_foot_mapzen.txt