1. add stream_map.h
1. modify the key of stream_map is stream_addr
2. add stream_addr.h/stream_addr.cc
3. add stream.h/stream.cc
4. add stream_types.h/stream_types.cc
1. add timer. (to be continue.)
Merge branch 'master' into wip-stream-map

Conflicts:
	test/logger_test.cc