Merge pull request #9 from aibou/master

'delete timeboard' API returns 204 when the deletion was successful

lib/dashdog/client.rb

@@ -45,7 +45,7 @@ def update_timeboard(tb)
 
     def delete_timeboard(id)
       ret = @api.delete_dashboard(id)
-      raise RuntimeError, ret[1]['errors'] if ret[0] != '200'
+      raise RuntimeError, ret[1]['errors'] if ret[0] != '204'
     end
 
     def create_screenboard(sb)