Adding a TODO file.
Cleaned up README

- renamed file
- cleaned up language
- backticks where appropriate
- restructured some sections
- documented `--debug` option
- documented the package files which will active PackageManagers
Cleaned up gemspec

- added self to author list
- updated DESCRIPTION to be snappier
Preparing CHANGELOG for v1.2

- documented `--debug` option
Forgot to quote.
Version bump to v1.2
Cleanup to README
Package, PackageManager declare their interfaces

* Core methods raise NotImplementedError
* Better documentation around the implementation patterns for subclasses

and documenting what needs to be done to implement a subclass properly.
WIP