Added ant target descriptions

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Added target to checkout the core-lib if not available

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Added develop target to download source zips

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Change project name to TruffleSOM

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Change eclipse project to rely on pre-build files

- left the old stuff in to re-enable for later experiments

Signed-off-by: Stefan Marr <git@stefan-marr.de>