Merge pull request #372 from youyong205/master

refactor
重构Agent datasender
Merge branch 'master' of https://github.com/dianping/cat
cat-agent代码完善，exceptionalert重构
delete local cat server
Merge pull request #373 from jialinsun/master

cat agent代码重构,exceptionalert重构
Merge branch 'master' of github.com:dianping/cat