systemed/iD — pull request #1206 by ansis (2013-03-29 20:49:11+00:00)
Title: support for overlay layers

This is mostly added for the Tiger2012 road overlay, #535

Overlay is just on/off. No adjustments and opacity changes.

Right now it the only overlay layer is Tiger2012. I just added an overlay=true in imagery.json. Does this need to be set somewhere upstream? Are we waiting on editor-imagery-index for that?