add update table capacity module
refactor updater module and add OverloadReport cache
add fronted page for database capacity monitor module
fix serval bugs
simply comparetor's logic
Merge branch 'master' of https://github.com/dianping/cat
trigger refresh
move database update module to new package, add none-metric-type log error
fix url build bug
Merge pull request #490 from youyong205/master

fix url build bug
Merge branch 'master' of https://github.com/dianping/cat
refactore database capacity module
remove log for debug
Merge pull request #489 from jialinsun/master

modify AxisXLabel for event & transaction bar
Merge pull request #486 from leonindy/master

add table capacity module, including backend updater task and frontend page
Merge branch 'master' of https://github.com/dianping/cat
modify baseline handle