Add package.json for npm support

[lutangar]

As requested in #37, this add the package.json for npm support.
This also fix usage with import/require synthax, otherwise this PR would be useless:
ES6:

import porthole from 'porthole';

RequireJs:

var porthole = require("porthole");

What's left to you:
Choose a version number that suits you for the package (1.0.0 as for now) and I'll change it in this PR.

Once merged, you're good to publish this on your own:

npm adduser
npm publish

more infos here https://docs.npmjs.com/getting-started/publishing-npm-packages

Cheers.

[indraneel]

@ternarylabs any timeline on this being merged? Would love NPM support!

[ismriv]

Same here. This is blocking me from using it - don't really want to copy & paste the module :)

[justinanastos]

I've been using this in prod for a few weeks with no issues. Can you merge this in or add @lutangar as a collaborator?

[justinanastos]

@ternarylabs Can you please merge this PR?

[indraneel]

thanks @georges!

[georges]

ah, looks like a (unrelated) porthole package already exists on npmjs

https://www.npmjs.com/package/porthole

any suggestion on how to best handle this?

[lutangar]

@georges you might consider using a scope like @ternarylabs/porthole see https://docs.npmjs.com/misc/scope
Or just choose another package name of your liking.

In any case you'll have to change the name used in the package.json.

[jonhallur]

Is it on npm yet ?