Fixed Geometry.faceVertexUvs type

faceVertexUvs: Vector2[][][];

The meaning of the arrays:
1) Array of UV layers
2) Array of faces
3) Array of UV coordinates per face

Example Usage:
geometry.faces.push(new THREE.Face3(0, 1, 2));
geometry.faceVertexUvs[0].push([
  new THREE.Vector2(0, 0),
  new THREE.Vector2(1, 0),
  new THREE.Vector2(0, 1)
]);