Add three-node example to java reference app

Add configs for a three-node example, and add changes to README.md
describing it. Additionally, since there are now multiple examples, move
the single-node version to a subdirectory under example.

Minor updates to start* for consistency with the single-node config.
Remove 'Getting Started' section

This material is well covered on the Sirius wiki now. We probably only
need to maintain it in one place, and Sirius's Getting Started page is
probably the right place.
Unify formatting across README.md files

We were using some overly large headers on some pages, so reduce the
size of those. Also, remove the redundant first-line headers.
Merge pull request #19 from clinedome-work/add-three-node-example

Add three node example; README cleanup
Remove .travis.yml

We don't really need the reference app to run on travis.