API Documentation

[hammy275]

Depends on #273, of course.

Before 1.5.0's release, there needs to be good documentation on the API. It should have, at the minimum:

• A tutorial for building an Immersive using the ImmersiveBuilder
• A tutorial for building an Immersive by directly implementing Immersive
• Links to the API javadocs.

[hammy275]

https://github.com/hammy275/hammy275.github.io/commit/32fb2501e684304b11ac975e7a9a391c8bc7a26c makes building the Javadocs and Jekyll site into one very easy. Once 1.5.0 beta 2 is ready to go, linking from the Jekyll side into the Javadoc side is all I'll need to do!