- 'lastfm 'command is now split into subcommands, wrapping around one shared function (Closes#2).
- Use bolding for prettier formatting in output.
- Update command help/documentation to be more consistent (use "user", not "id" to refer to configured users).
- Rename variables named 'id' -> 'user', since the previous is collides with a built in function.
- Update tests accordingly.