#10 Use console_scripts to add cli tool

Use the console_scripts entry point to add the command-line tool to path rather than a symlink (for cross-platform compatibility with anything other than *nix).

It is imperative that all code contributed be legitimately free software. For that reason, code from anonymous (or pseudonymous) contributors will not be accepted.

Regardless, I strongly dislike how console_scripts requires a main() function. I don't want main to be callable by a different program (perhaps a UI program) which imports libray as a dependency.