prevent checkMetrics handler from responding so other handlers can still use the request; renamed checkMetrics handler; added checkMetricsFinalizeHandler for responding
added checkMetricsWebUI handler, serving at :8088
supporting multiple agents in WebUI; forward port 8088 in Vagrant;
tiny change: not relying on /vagrant mount so it's easier to use natively
fixed bug in WebUI server: channel is too small that it gets overflow;
remove the FAKE metric
Merge pull request #27 from racker/songgao/adding_visualization

add some visualization to examples/monitoring