b19 - 2013-08-01

Breaking changes:
* Replaced tessellators and meshes with geometry. In particular:
  * Replaced CubeMapEllipsoidTessellator with EllipsoidGeometry.
  * Replaced BoxTessellator with BoxGeometry.
  * Replaced ExtentTessletaor with ExtentGeometry.
  * Removed PlaneTessellator. It was incomplete and not used.
  * Renamed MeshFilters to GeometryPipeline.
  * Renamed MeshFilters.toWireframeInPlace to GeometryPipeline.toWireframe.
  * Removed MeshFilters.mapAttributeIndices. It was not used.
  * Renamed Context.createVertexArrayFromMesh to Context.createVertexArrayFromGeometry. Likewise, renamed mesh constructor property to geometry.
  * Renamed ComponentDatatype.*.toTypedArray to ComponentDatatype.*.createTypedArray.
  * Removed Polygon.configureExtent. Use ExtentPrimitive instead.
  * Removed Polygon.bufferUsage. It is no longer needed.
  * Removed height and textureRotationAngle arguments from Polygon setPositions and configureFromPolygonHierarchy functions. Use Polygon height and textureRotationAngle properties.
  * Renamed PolygonPipeline.cleanUp to PolygonPipeline.removeDuplicates.
  * Removed PolygonPipeline.wrapLongitude. Use GeometryPipeline.wrapLongitude instead.
  * Added surfaceHeight parameter to BoundingSphere.fromExtent3D.
  * Added surfaceHeight parameter to Extent.subsample.
  * Renamed pointInsideTriangle2D to pointInsideTriangle.
  * Renamed getLogo to getCredit for ImageryProvider and TerrainProvider.
* Added Geometry and Appearances #911.
* Added property intersectionWidth to DynamicCone, DynamicPyramid, CustomSensorVolume, and RectangularPyramidSensorVolume.
* Added ExtentPrimitive.
* Added PolylinePipeline.removeDuplicates.
* Added barycentricCoordinates to compute the barycentric coordinates of a point in a triangle.
* Added BoundingSphere.fromEllipsoid.
* Added BoundingSphere.projectTo2D.
* Added Extent.fromDegrees.
* Added czm_tangentToEyeSpaceMatrix built-in GLSL function.
* Added debugging aids for low-level rendering: DrawCommand.debugShowBoundingVolume and Scene.debugCommandFilter.
* Added extrusion to ExtentGeometry.
* Added Credit and CreditDisplay for displaying credits on the screen.
* Improved performance and visual quality of CustomSensorVolume and RectangularPyramidSensorVolume.
* Improved the performance of drawing polygons created with configureFromPolygonHierarchy.
fixed RequireJS paths to not be relative but absolute module IDs
bumped version