fix classpath's for atmosphere jars (was 2.0.7 should be 2.0.9 as included project)

classpath settings not updated to atmosphere 2.0.9 jars in (e66a8e8ce74edf7a704ed779af0c0e764fdcc669).
In a clean IDE setup as described in the wiki, the dependencies can't be resolved without manually adapt the classpath.
please also fix it in master if not already done.