TileManager: allow setting zoomlevel-switch thresholds
add option for non-billboard MarkerSymbols
VertexData: float params add() versions
wip: Bucket API
use MAX_INDICES with bindQuadIndices()
nicer gl api

- java class name should suffice as namespace
- also use import static gl instance seems to work now with Gwt
fixup: area fade
wip: StyleBuilder
fix: AreaStyle blend
android-example: reenable cache..
PolygonBucket: enable fade and tinting of textured polygons
ExtrusionLayer: animate when loaded
pass fx option with S3DBLayer constructor
updated default theme:

- use textures for slight roughness of 'natural' features
- increase font size
wip: show tiles at the highest scale

need to investigate the real cause..