Converted run_tests.sh to python script (#168)
Win32 and posix compatibility
Fixed nits and rebased to latest version
changed run_tests.py to chmod+x
Call the correct python executable
Made path platform safe, changed pip import and call to subprocess.call to pip, moved 'except IOError' closer to potential source
remove virtualenv installation
adjust README
added VENV_DIR variable
Rewrite virtual env download and activation using tmp directory
Install via requirements.txt
add except IOError
Addressed nits of previous review
include mozfile dependency, address nits
Sort out Error codes and dependencies in alphabetic order
mozfile version update to 1.1