ENG-6317 Changed TPS graph to plot off @Statistics timestamp
ENG-6317 Stopped updating the tps and latency graph when no @Statistics results
ENG-6317 Changed latency/tps graphs
ENG-6317 Removed unnecissary var
ENG-6317 Re-added conditional to remove chance of dividing by 0
ENG-6317 Added timer to flat line latency when no transactions
Merge pull request #1399 from VoltDB/ENG-6317

ENG-6317 Changed graph timestamp to use @Statistics instead of JS timestamp