make: use -Os for msba2 boards
transceiver: replace DEBUG with DEBUGF
HACK: reduce max routing table size to 8
ccnl: always calculate chunk size by payload size
ccnl: added UDP forwarding for the appserver

This is WIP. If 6LoWPAN is available, the appserver will broadcast over
UDP for the content.
sixlowpan: decrement processing semaphore when discarding
HACK: get rid of TCP