modify the domain validate
fix domain blank bug
remove unused code
merge code
fix tps comupte
fix a bug: add delta feature for some metrics in heartbeat's history part
Merge branch 'master' of github.com:dianping/cat
modify the version
add the release note
Merge pull request #687 from youyong205/master

refactor code
Merge pull request #686 from jialinsun/master

refactor LDAP, add transaction event piechart and statistics
Merge pull request #684 from leonindy/master

fix a bug: add delta feature for some metrics in heartbeat's history part
refactor visitor