Renamed a files from .pl to .pm
Added a class and unit tests for Room
Refactored a few methods
Removed count functions. Seemingly useless.

Intersection code might get deleted soon too
Improved _to_string function for readability. Double digits everytime
Stub activity class, and added failing unit tests
Added a working Module class, and passing Module unit tests
Working Person class (for staff and students) and passing unit tests
Working Room manager and passing unit tests
Added a line count shell script to ambigously judge productivity