fix a bug: add delta feature for some metrics in heartbeat's history part
Merge branch 'master' of github.com:dianping/cat
refactor LDAP
add transaction event piechart and statistics
Merge branch 'master' of https://github.com/dianping/cat
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
amend buildExtensionGraph method
amend convert to delta method in heartbeat alert
Merge pull request #688 from jialinsun/master

refactor visitor
check whether data exists in heartbeat alert
Merge branch 'master' of github.com:dianping/cat
modify css
Merge pull request #689 from leonindy/master

amend serval methods in heartbeat module
Merge pull request #690 from jialinsun/master

modify css