Packagized the previously single-file banzai.py
Fix import
If iterable is mutable, set self.upstream
Changed name of `component` to make step.
Added string filterer and tests
Trying to work with itertools.compress wasn't quite the best idea
Newline
Added support for generators, C-exention functions like operator.itemgetter,
and made pipeline automatically wrap functions in make_step decorator.
Added find_files and tests
Fixed newlines
Little things