add simple log system

Change-Id: I1bb1153f4d8221bec7d4a70fd5385a2b6d311a30
Signed-off-by: Yate <e.yangting@gmail.com>
Merge branch 'master' of https://github.com/yangting/glivesvr.git

Conflicts:
	glives/src/glive/glivesvr.go
	glives/src/glive/log/log.go
	glives/src/glive/session/connmgr.go