Combine External JavaScript

First of all, thank you very much for this plugin. It’s easily the best one out there. All it takes is a little configuration and time. I do have one question though.

Unless I’m doing something incorrectly, how do I combine external JavaScript? Specifically:

There are 5 JavaScript files served from pagead2.googlesyndication.com. They should be combined into as few files as possible.
//pagead2.googlesyndication.com/pagead/expansion_embed.js
//pagead2.googlesyndication.com/pagead/js/r20130815/r20110914/abg.js
//pagead2.googlesyndication.com/pagead/js/r20130815/r20130206/show_ads_impl.js
//pagead2.googlesyndication.com/pagead/osd.js
//pagead2.googlesyndication.com/pagead/show_ads.js

There are 2 JavaScript files served from ajax.googleapis.com. They should be combined into as few files as possible.
//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js
//ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js

There are 2 JavaScript files served from connect.facebook.net. They should be combined into as few files as possible.
//connect.facebook.net/en_US/all.js
//connect.facebook.net/en_US/all.js#xfbml=1

There are 2 JavaScript files served from platform.linkedin.com. They should be combined into as few files as possible.
//platform.linkedin.com/js/nonSecureAnonymousFramework?v=0.0.2000-RC1.29365-1407&
//platform.linkedin.com/in.js

There are 2 JavaScript files served from apis.google.com. They should be combined into as few files as possible.
//apis.google.com/_/scs/apps-static/_/js/k=oz.gapi.nl.TFpVkpDG41o.O/m=plusone/rt=j/sv=1/d=1/ed=1/am=EQ/rs=AItRS…
//apis.google.com/js/plusone.js

https://www.ads-software.com/plugins/w3-total-cache/