Add dist/index.metadata.json to cleanup and fix typo dist/LICENSE

[beeman]

Hi @cyrilletuzi,

First of all thanks for this module and your blog! It showed my how to create Angular modules that can be used in other projects, just what I needed.

I have taken the project and stripped it to a starter that I can use to easily create new modules. I am looking at building a generator for it. Obviously with credit for the initial implementation to you.

In the process I found 2 small issues in the cleanup script, this PR fixes those.

Cheers B

[beeman]

Btw, some other small adjustments I made are these:

• npm run script to publish to npm.
• excluding all but package.json from dist to be added to git.

Let me know if you want these added to the PR too :)

[cyrilletuzi]

Thanks for this PR !

About excluding files in dist, even if they are just build files, I prefer to keep them on github as it's what npm users get, so they can explore them if they want (even if they can do so locally).