Require aperture index rather than commands directly.
Add some command aliases.
Rename spawn-npm -> npm-install.
Init meta information in package.json.

Added MIT license file.
Remove cruft.
Revert to requiring commands directly.

Requiring command modules directly should increase startup time for the
executable. Node will not have to load all the commands + their
dependencies when the nature of the executable means it'll only ever be
executing a single command.
Merge pull request #7 from requireio/aliases-and-refactor

Aliases, package.json meta info and refactor