Remove all library binaries.

Use maven's pom.xml to load the dependencies.

Note that we don't use Maven to build the full application. Instead,
Ant (using maven-ant-tasks) picks up the library dependencies and
downloads them.
Maven POM defines source encoding.

This avoids the encoding warning "build is platform dependent".
Mac class path is defined dynamically.

The class path is build up out of the dependencies set in Maven's POM
file.
Windows build dynamically loads dependencies from Maven POM.
Forgot to include Python packages in Mac build.