Use a newer Eclipse to build IvyDEIt was not working with Java 8 on MacOS X and with the Eclipse 3.7 because of some lookup for a 'Classes' folder in the JDK which doesn't exist
small enhancements to the buildfile - some target-dependencies because of used properties - extract xooki-initialisation - dont unzip if not neccessary - make required directory - rat: check preconditions