Provide an avenue for zip_safe and keywords

[KevinTyrrell]

Both zip_safe and keywords elements are missing from setup.py.

Consider providing a small section where users can opt-in to define them.

ZIP_UNSAFE = None # Modify this variable to declare the project as unsafe to be ran while zipped
KEYWORDS = ""  # Modify this string to include comma separated keywords defining your project



setup(
    ...
    zip_safe = ZIP_UNSAFE is None,
    keywords = KEYWORDS,
)