增加注释。
Merge branch 'master' of https://github.com/sailzeng/zcelib
Merge branch 'master' of https://github.com/sailzeng/zcelib

Conflicts:
	src/commlib/zcelib/zce_async_fw_coroutine.h
Merge branch 'master' of https://github.com/sailzeng/zcelib

Conflicts:
	src/commlib/zcelib/zce_async_fw_coroutine.cpp
	src/commlib/zcelib/zce_async_fw_coroutine.h
Merge branch 'master' of https://github.com/sailzeng/zcelib

Conflicts:
	src/commlib/zcelib/zce_async_fw_coroutine.cpp
	src/commlib/zcelib/zce_async_fw_coroutine.h