Package resumable.js as a node module (please consider adding it to the npm registry)

Add package.json, move resumable-node from samples back to / and modify
sample app to reflect the change.

you can see the package being used in:
http://github.com/inaes-tic/mbc-playout

it allows an easy 2 steps install :
 | 1) install the package
 | $ npm install git@github.com:inaes-tic/resumable.js
 | # could be just npm install resumable.js
 |
 | 2) plug it inside your code
 | require ('resumable.js')
 | serve javascript from require.resolve ('resumable.js/resumable.js');

Please consider submitting to npmjs.org to be added to the registry.
more info: https://npmjs.org/doc/developers.html

;td:lr; npm publishing in 2 steps.
 | 1) Create a User Account
 | Create a user with the adduser command. It works like this:
 |
 | $ npm adduser
 | and then follow the prompts.
 |
 | This is documented better in adduser (https://npmjs.org/doc/adduser.html).
 |
 | 2) Publish your package
 | This part's easy. IN the root of your folder, do this:
 |
 | $ npm publish
 |
 | You can give publish a url to a tarball, or a filename of a tarball, or a
 | path to a folder.
 |
 | Note that pretty much everything in that folder will be exposed by default.
 | So, if you have secret stuff in there, use a .npmignore file to list out the
 | globs to ignore, or publish from a fresh checkout.

Signed-off-by: Niv Sardi <xaiki@inaes.gob.ar>