refactor tile server to its on class; start client-side lib livetexture.js
remove dead code
add cd.js
allow each layer to start a tile server
add ModelSet...
allow models to be served as tiles individually. update livetest to show the currently served layers
tweaks
remove cruft
dont show layers until elevation is loaded
possible mechanism for sampling among layers
Brush strokes now render centered about mouse.
Merge remote-tracking branch 'upstream/master'