Removed teaching stuff.
Gradle build script work in progress.
Gradle build works now.
Gradle build generates Eclipse project files and downloads jars.

To build, do:

    gradle build

To generate Eclipse project files, do:

    gradle eclipse
Moved resources around, and removed legacy build system.
Moved test classes into separate folder following Maven conventions.
Got rid of unused top-level resource.
Added developer documentation to README.md
Merge branch 'gradle'