change Makefile to be aware of proto file changes
change Makefile to be aware of proto file changes

larryxiao/peloton-1,ranxian/peloton,larryxiao/peloton,larryxiao/peloton-1,larryxiao/peloton,amaliujia/CMUDB-peloton,ranxian/peloton,larryxiao/peloton-1,amaliujia/CMUDB-peloton,amaliujia/CMUDB-peloton,larryxiao/peloton,ranxian/peloton,larryxiao/peloton-1,larryxiao/peloton,ranxian/peloton,ranxian/peloton,larryxiao/peloton,ranxian/peloton,amaliujia/CMUDB-peloton,larryxiao/peloton-1,larryxiao/peloton-1,larryxiao/peloton,larryxiao/peloton-1,amaliujia/CMUDB-peloton,larryxiao/peloton,amaliujia/CMUDB-peloton,amaliujia/CMUDB-peloton