Added license
Merge remote-tracking branch 'origin/add_license'
Fixed issue where map layer does not update #24
Using Kitware open source license
Merge remote-tracking branch 'origin/bug24_fix_map_layer_not_updating'
Merge remote-tracking branch 'origin/update_license'
Merge remote-tracking branch 'origin/d3_api'

Conflicts:
	src/core/layer.js
Merge remote-tracking branch 'origin/master' into d3_api