Build with Maven
Merge pull request #2 from benjchristensen/build

Build with Maven
ComposableListSolution

- answers in ComposableListSolution
- start of unit testing for ComposableListSolution
- no unit test yet to compare against ComposableListExercises
- split up types and interfaces as needed to work in Java (no dynamic typing like Javascript to allow comparing different implementations without shared types)
- fixes a few small issues
- questions 24/25 left without answers, look like they need to be finished (no comments on them)
Merge pull request #3 from benjchristensen/answers

ComposableListSolution
Adding explanation to the two last remaining exercises.
Update README.md