add activity page for app
add title to app alert config page
add api for add and delte apps
fix delete app bug
add metricRuleConfigUpdate page to config tree, default invisible
add app command modify handler
add command modify pages
Merge branch 'master' of https://github.com/dianping/cat

Conflicts:

cat-core/src/main/java/com/dianping/cat/config/app/AppConfigManager.java
	cat-home/src/main/java/com/dianping/cat/report/page/app/Payload.java
	cat-home/src/main/webapp/WEB-INF/tags/body.tag
	cat-home/src/main/webapp/jsp/system/configTree.jsp
move duplicate tags caused by merge
Merge pull request #556 from leonindy/master

add some features for app command module, make global config page invisiable