Continuous Integration

The master branch is now monitored by TavisCI for linux and mac builds, and Appveyor for windows.

Initially this performs ant test which compiles the jars, and does minimal test, but at least launches the program, giving us a baseline level of confidence.

Ideally, we'll migrate to continuous deployment, when we have a more automated tests.

What the exercise has also shown is that we should probably migrate to Maven to offload managing most of the third-party libraries.