0.9.5

• fixes for windows: cmd wrapper, argv expansion
• only support CAPITALIZED drive letters on windows to avoid path splitting issue
• disable lowercase drive letter tests
• adds make.bat file, smoke test on windows, disable fail-fast tests
• stop changing the path sep on the root path in the env test
• updates to envstack banner for exit hints
• skip cmd tests if not on linux
• support --quiet in envstack shell
• minor updates to cache env file
• bump version to 0.9.5