add Mb, Gb, Mb/s, Gb/s to network rule
transfer NetworkAlert to non-MetricItemConfig
Merge pull request #352 from jialinsun/master

网络监控修改，cat-agent/pom.xml修改
add rule for each business MetricItemConfig
fix bugs which can not insert config when all fail
change td width for manipulation button; hide allBusinessRule page
modify the jsp
fix bugs which throw exception when remove an object while looping
modify the manager
merge newest code
Merge pull request #353 from leonindy/master

add unit to NetworkAlertConfig, remove itemConfig-dependency from NetworkAlert, add rule-config page for business items, fix serveral bugs
change AlertInfo map key to String
Merge pull request #354 from youyong205/master

modify the jsp
add MB GB MB/s GB/s, rename updateRule button
change rules from list to map
fix bug for rule_config.xml
refactor RuleType
Merge branch 'master' of https://github.com/dianping/cat
Merge pull request #356 from leonindy/master

refactor RuleType, change rules from list to map, change AlertInfo map
add 2 new RuleType for fluctuate case