Merge pull request #242 from youyong205/master

merge from biz
Merge pull request #244 from dianping/biz

Biz
Merge pull request #248 from youyong205/master

merge from biz
Merge pull request #253 from youyong205/master

merge from biz
pull request test
Merge pull request #255 from youyong205/master

biz
Merge pull request #262 from youyong205/master

Biz
Merge branch 'master' of https://github.com/dianping/cat
Create netcat.c
u
Merge branch 'master' of https://github.com/zengwei0771/cat
Create switchcat.py
add http api for metric
modify the code format
Update switchcat.py
u
u
rename systemMonitor to monitor, and modify code after review
rename systemMonitor to monitor, and modify code after review
modify document