use latest node-mapnik@1.4.12 tag
fixes #640
fix zoomedto close button
Merge pull request #664 from mapbox/fix-close-button

fix zoomedto close button
shift click on layers to do stuff
Merge pull request #666 from mapbox/all-or-nothing

shift click on layers
Merge pull request #665 from mapbox/licenceext

add .txt to version and licence
fix #667 zoomedto issues
Merge pull request #669 from mapbox/zoomedto

fix #667 zoomedto issues
add 2x font images, fix #671
Merge pull request #673 from mapbox/retina-fonts

add 2x font images, fix #671
Update font tests. Got left behind by #673.
center content
fix font image sizes
Merge pull request #682 from mapbox/fullwidth-intro

Fullwidth intro
Support both deflate and gzip content encoding for VTs