Attempted to address various cross-platform installation issues:
- Removed all hard-coded references to file-paths, and replaced them
with paths provided by `appdirs`.
- Removed (erroneously inserted) default file paths which would never be
checked due to application logic.
- Modified `setup.py` to no longer install a configuration file. The
mechanics are still in place to **read** a configuration file, but
after examination, I've concluded that the installation of that file
is best left to package maintainers rather than `cheat` itself.
