output for 16-color shells
less gray for Shell4
memoize colorcode()
Merge branch 'master' into devel
Merge branch 'master' into devel
Merge branch 'master' of https://github.com/KillaW0lf04/shellpic into devel
Merge branch 'master' into devel
improved color selection for --shell4
cleaned up argument parsing, fixed inconsistent naming
ditch PIL and depend on Pillow instead
simple integration tests
Version 1.3