Jeff Mossop perf comments

Good work on the project!!

Just some feedback for ya:

- Try to clarify yaml config setup

- There are differences in how to refer to directorys in the 2 examples

- preferences : {} should be preferences: {}

- creation of the 'extension_perf_reports' directory should be incorporated into the zip with the python files to save the user from having to make the directory.

- Give some sort of feedback on test conclusions, it currently just dumps you back to the DOS prompt.

- Just say tests completed successfully/ failed etc.