去掉puppet，重构exception alert
clean code，完善tomcat监测机制
Merge branch 'master' of https://github.com/jialinsun/cat

Conflicts:

cat-agent/src/main/java/com/dianping/cat/agent/monitor/EnvironmentConfig
.java

cat-agent/src/main/java/com/dianping/cat/agent/monitor/executors/jvm/JVM
MemoryExecutor.java

cat-home/src/main/java/com/dianping/cat/report/task/alert/exception/Exce
ptionAlert.java
	cat-home/src/main/webapp/jsp/report/system.jsp