Make the package installable via npm/yarn

[igghera]

This PR contains all the changes needed to make the package available via npm install turn.js or yarn add turn.js.

Apart from adding a package.json file and removing the IIFE wrapper I have not changed any of the functionalities of the library. I have also pinpointed the version of jQuery to 1.12.0 because other versions were breaking the page flip mechanism (there's another issue for that, opened by someone else).

[odahcam]

this repo is dead man, i have an active fork in case you still want to contribute

[igghera]

Yeah I had realised it, but I thought I would try anyway.
I'll have a look at your repo, thx

[odahcam]

@igghera you'r welcome ;)

[Quix0r]

@odahcam I cannot find your repo: https://github.com/blasten/turn.js/network/members

[odahcam]

My repo is archived, sorry. @blasten is working with the polymer folks, maybe a webcomponent based e-book catches his attention. This code is too outdated today, so was mine and I don't wanna encourage people to follow this steps, so I archived my fork.