Additions

AggregateEmbedding, which is a starting point for traditional analytics. Supports groupBy and basic aggregate functions
BallChart, which is an exploration for replacing the 2D pie chart; color scales still need configurability
aggregate.html example to demonstrate basic aggregate usage
Default simple skybox, which can be turned on by passing { room: true } to initScene (adapted from the example from Boris Smus' ray-input)
Ability to use arbitrary Object3Ds in MeshEmbeddings, and updated Iris example to show this

Build

All dependencies are now imported as ES6 modules, and then browserified and packaged together. Consequently, all extra script tags have been removed from examples. This required some tweaks to ray-input and webvr-boilerplate, so these dependencies are now satisfied from forked repos