being more explicit about what the fixture provides as an output, instead of
solely describing the site effects.
Also the consumer is now responsible for the module directory layout.
pytest compared to built-in unittest does not discover test suites based on a
directory being marked as a module, instead matching against the basename of a
file to determine whether it is a test suite or not.
Implemented Rabin-Karp rolling hash class abstraction.
After testing muliple algorithms for efficient substring searching in a stream
abstracted by a ring buffer, I've dropped the idea of using KMP in favor of
implementing my own algorithm based of the Rabin-Karp rolling hash algorithm.
