Check encode time for mandatory resolutions.

Currently it there is no criteria for failing or passing depending on the encode time. It will print out the average, max and min, also an error message will be printed out as reportInfo (do not want to fail the test) when no stats can be gathered. 

Since I do know any acceptable encode time value ranges I think this is sufficient for now.
Can you add a comment saying that when the connection is closed this calls the callback exactly once with an array of the gathered stats.