[INTERNAL] removed the explicit adding of the classpath

Although it is quite common to use Eclipse variables in the classpath it
is possible to just fetch the source code and manually initializing the
classpath with absolute paths in the Eclipse IDE. This may fail badly
for partial shared projects where developers do not want to share this
file.


Change-Id: I8cb143e71793b0fa9e934c28677ff3a8c1a8d220
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1289
Tested-by: Jenkins CI
Reviewed-by: Nils Bussas <nils.bussas@gmail.com>
Reviewed-by: Franz Zieris <zieris@inf.fu-berlin.de>
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>