added automatic zxy
leave _geometry on docs object
Merge branch 'master' into auto-zxy
Sketch of using workers for the doc processing portion of indexing.
geocoder variable zoom support
Merge branch 'auto-zxy' of https://github.com/mapbox/carmen into auto-zxy
Merge branch 'auto-zxy' into index-workers

Conflicts:
	lib/index.js
ref maxzoom instead of zoom
pull zoom from 'from' source
Merge branch 'master' of https://github.com/mapbox/carmen into auto-zxy
Merge branch 'auto-zxy' of https://github.com/mapbox/carmen into auto-zxy
add zoom param to tests
Merge branch 'auto-zxy' of https://github.com/mapbox/carmen into auto-zxy
add zoom param to geocoder tests
update bench loadDoc to new loadDoc interface
account for geocoder_resolution in indexing
fix geocoder.zoom in zxy indexer
check for valid zoom levels -- refs #154
document zoom restriction -- refs #155
update tile-cover with multipoint optimization