Make extension work with latest Firefox release #11

This is for issue #11 and issue #10.
I had to : 
- change the path of the current process executable in currentAppBinary
- added the new extra parameter in saveURI method 
- dropped the downloading and using of mozmill-automation, instead use the environment commands instead of python scripts(./testrun_functional.py / testrun_functional) 
- also we don't have a latest-environment anymore so I added the mozmill-env 2.0.6 until we can find something else here.