Added a requirements.txt.
Refactored interp to use introspection.

Using list comprehension and introspection removes some complexity, and
gets rid of the reliance on globbing. Adding __all__ to the __init__.py
makes it possible to import *.
Merge pull request #1 from george2/fb-requirements-txt

Added a requirements.txt.
Improved speed of music module
Fixed a typo in the interpreter
Merge branch 'master' into pr/2
Improved password usage, made music a little faster
Typo in filename.
Merge branch 'master' of https://github.com/n8many/Pixel-Interpreter-Framework