Correctly removes old status classes on the number widget when updating the status

[davefp]

Fixes #45

[crcastle]

Would this be a better way to update the status- class? This will handle statuses outside of just "danger" and "warning"

onData: (data) ->
  if data.status
    # clear existing "status-*" classes
      $(@get('node')).attr 'class', (i,c) ->
        c.replace /\bstatus-\S+/g, ''
      # add new class
      $(@get('node')).addClass "status-#{data.status}"

[pushmatrix]

Yeah, I like the flexibility of @crcastle's approach. @davefp, can you incorporate that into your PR?

[davefp]

@pushmatrix Updated with @crcastle's suggestions.

[kevinthompson]

👍