add a proper package.json

[VinSpee]

Hi! I understand that "bower is the preferred package manager for am-css", but adding proper npm support is pretty easy. Care to accept this PR and do an npm publish?

[benschwarz]

Thanks @VinSpee

For this to be accepted, I'd like to see the react/data- changes removed from this branch, and I'd like to see something automated to create the tag in git, bump npm's package.json, push to npm, and push to github.

[VinSpee]

@benschwarz oops sorry about that! I'll get those out of this PR.

as far as versioning, are you familiar with the npm version command? It's the preferred way of handling such things: https://www.npmjs.org/doc/cli/npm-version.html

[benschwarz]

@VinSpee Yeah—I just don't want the git tags or the npm version to get out of sync if I'm quickly making releases. (I don't see the grid changing much, though).

Anyway, lets get this PR cleaned up :+1: