Derive token from cid, bring back the custom version of peerjs

Since [this commit](https://github.com/bitpay/copay/commit/c5aa3372d2174e7c2c1bfb40ee5e5e89ba88084c) we have been using a peerjs version without the ability to reconnect.

This PR adds back that version and derives the token from the CID to avoid other issues.

Closes #779 

Later, the current version is 0.3.8. They merged our changes on master but
never publish a new version for bower.


On Mon, Jul 7, 2014 at 1:43 PM, Manuel Aráoz <notifications@github.com>
wrote:

> In index.html:
>
> > @@ -914,7 +914,7 @@ <h3 class="text-center">Page not found</h3>
> >      <script src="lib/angular-route/angular-route.min.js"></script>
> >      <script src="lib/angular-foundation/mm-foundation.min.js"></script>
> >      <script src="lib/angular-foundation/mm-foundation-tpls.min.js"></script>
> > -    <script src="lib/peerjs/peer.min.js"></script>
> > +    <script src="lib/peer.js"></script> <!-- TODO Change this on PeerJS version 0.3.9 -->
>
> is this TODO for now or later?
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/bitpay/copay/pull/830/files#r14607074>.
>