Merge pull request #43 from ipa-fxm/new_features

preliminary fix for correctly compose message fragments wrt message_size
Update test_non-ros_service_server_complex-srv.py

requested receiving fragment size cannot be higher than estimated minimum fragment header overhead (currently 60)
Update fragmentation.py

logging
Update fragmentation.py
Merge pull request #1 from pttp/new_features

fix for requests with too small fragment sizes (<60)