Avoid needing an external dependency.

- Drop unneeded bundled libraries
- Use jQuery from a CDN

follow-up from #1146. Very high level but this should cover the relevant code paths.

The jingle offer was taken from a current focus offer with a few bits removed:
* ssrc-info element
* web-socket element inside transport
* rtcp-mux element inside transport
* bridge-session element
* bundle element (removed in focus already)

* refactor packet2JSON to not use jquery

also added unit tests for it and switched to use chrome-headless instead
of phantomjs

* update package-lock

* squash: undo sha512 to sha1 conversion in package-lock

ESLint 4.8.0 discovers a lot of error related to formatting. While I
tried to fix as many of them as possible, a portion of them actually go
against our coding style. In such a case, I've disabled the indent rule
which effectively leaves it as it was before ESLint 4.8.0.

Webpack 2 defines module.exports as a read-only property in ES6 modules.