fixed byte order in reception of IEEE802.15.4 frames according to the fixed sending in f6c37b0b4fab35ab50aa9095f1c584fb74f92d0a
made stacks for RPL threads static and using pre-defined sizes
Merge pull request #307 from OlegHahm/ieee802154_frame_recv

fixed byte order in reception of IEEE802.15.4 frames
Merge pull request #341 from OlegHahm/rpl_fixes

made stacks for RPL threads static and using pre-defined sizes