added classes folder to ignore list
added classes folder to ignore list

Signed-off-by: Philipp Hoenisch <95d42350090ba918605a7eca946ed127d06f4f08@gmail.com>

openengsb/openengsb,openengsb/openengsb,openengsb/openengsb,openengsb/openengsb,openengsb/openengsb,openengsb/openengsb