Merge branch 'dev'

* dev: (36 commits)
  v0.3.2
  fix type
  default wma factor: 0.1
  normalize upper time
  color black time range
  e realtime upper time range
  update changes
  typo
  single quote
  add example statsd configs to work with bell
  fix start/step convert
  using hasOwnProperty
  rebuild hipchat alerter
  bell.js header comments using license
  add version meta to webapp; use package version
  better `secs2str`
  finally, the past time can be displayed!https://github.com/eleme/node-bell/issues/17
  return false on illegal timespan
  add switch helper function to template
  update quickenters schema
  ...
update data flow diag