Added additional tests for cd32 module

Also, new command was added to utils - run_command which is an
generalized subprocess.call function.

Requirements is now added with module six, which was needed to detect
string-like objects in sane way.

tox.ini

@@ -7,7 +7,9 @@ usedevelop = True
 usedevelop=True
 setenv = COVERAGE_FILE = .coverage
 commands = py.test --cov=fs_uae_wrapper --cov-report=term-missing
-deps = -r{toxinidir}/test-requirements.txt
+
+deps = -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
 
 [testenv:py27]
 deps = {[testenv]deps}