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.
This is overuse of closures/functions inside functions. These kind of functions you defined here.. do not need any environment from the enclosing functions analyzeStats_... therefore they should not be defined inside it. Feel free to move the to the file scope (which happens to be the global in JS... but really these functions would even be in a util.js and used across the project)

Adapted from [1]:
````
The Kapten asked: “How will I know when I have learned enough to use closures wisely?”
Banzen replied: “When you no longer wish to use them.”
````

[1]- http://thecodelesscode.com/case/121