Merge pull request #22 from hintjens/master

Renamed zproto_c -> zproto_codec_c
Merge pull request #23 from hintjens/master

Add explicit make target for code gen
Added new lines in bnf for better readability
Merge pull request #24 from sappo/master

Added new lines in bnf for better readability
Removed unnecessary pauses

- there should be no need to sleep before receiving messages
- the sleep makes selftesting obnoxiously slow
Message parsing was broken

- discarded routing_id when reading from ZMQ_ROUTER
- simplified _recv and _recv_wait methods
- properly collect routing_id in _decode method
- added selfcheck test on routing_id