Removed six as a dependency

Changed logic for checking if run_command argument is a list. Fixed
tests and refactoring save_save() method in cd32 module.

tox.ini

@@ -8,8 +8,7 @@ usedevelop=True
 setenv = COVERAGE_FILE = .coverage
 commands = py.test --cov=fs_uae_wrapper --cov-report=term-missing
 
-deps = -r{toxinidir}/requirements.txt
-       -r{toxinidir}/test-requirements.txt
+deps = -r{toxinidir}/test-requirements.txt
 
 [testenv:py27]
 deps = {[testenv]deps}