Replace jquery with accepted version for Mozilla approval process

[danBhentschel]

Message from reviewer:

re: bower_components/jquery/dist/jquery.min.js

Your add-on includes a JavaScript library file that doesn't match any versions known to us. We require all add-ons to use unmodified release versions.

We accept JQuery/JQuery-UI libraries downloaded from 'ajax.googleapis.com', 'jquery.com' or 'jqueryui.com'; and used without any modification. Minified versions are better. (file-name change does not matter)
I'm sorry, but we cannot accept modified, re-configured or customized libraries.