fix bugs which may cause exception
merge newest code
Merge branch 'master' of https://github.com/dianping/cat
Merge branch 'master' of https://github.com/dianping/cat
find tomcat pid 方法完善
Merge branch 'master' of https://github.com/dianping/cat
Merge branch 'master' of https://github.com/dianping/cat
add systemRuleConfig page, rename networkRuleConfig page
add system alert task
Merge pull request #378 from youyong205/master

fix bug
pass agent添加he和cat agent 重构
add default system rule
reslove conflicts
add alertType: error and warning
支持多个tomcat监控，paasAgent集成以及启动设置，异常警告中添加problem链接，重构一些代码
Merge pull request #376 from jialinsun/master

find tomcat pid 方法完善
merge newest code
Merge pull request #377 from leonindy/master

add system alert task and page
添加所有系统监控指标，重构Agent
clean code