cutomizable prefix grabber. proper support3d test. removed -o- prefix from transform property.
more clever prefix detection. (use unprefixed property when available.)
removed now obsolete prefix() utility method
fixed support3d to reuse transformProp. prefixProperty returns false instead of "" when the property isn't supported at all
fixed global var leak
Merge pull request #203 from tyrasd/upstream

Dragging still buggy with Opera 12.10. Also, support3d is always false.
Support other subdomains, tiger2012 tiles
Add osm mapnik, setup toggling a bit.
Fix tests
Remove unnecessary redraws
Highlight roads when hovering stroke (fixes #165)
Test background subdomains
Merge branch 'master' of github.com:systemed/iD
Split background sources into background_source
Refactor line drawing
Properly style natural-water. Fixes #211
Remove elastic tag when roads and areas are complete
Introduce Entity transients; fix #187
Add freezing specs
Remove duplicate intersection function