Merge pull request #373 from jialinsun/master

cat agent代码重构,exceptionalert重构
Merge branch 'master' of https://github.com/dianping/cat
Merge pull request #374 from jialinsun/master

cat agent代码重构,exceptionalert重构
Merge branch 'master' of https://github.com/dianping/cat
find tomcat pid 方法完善