layout: Use local copy of jquery and tablesorter

On Chrome these references were causing Insecure content warnings
and were also blocked by default. Thus various Uncaught
ReferenceError exceptions were thrown on gdash.wikimedia.org:

Uncaught ReferenceError: $ is not defined 
Uncaught TypeError: undefined is not a function bootstrap-twipsy.js:29
Uncaught TypeError: undefined is not a function bootstrap-scrollspy.js:23
Uncaught TypeError: undefined is not a function bootstrap-dropdown.js:29
Uncaught TypeError: Cannot read property 'fn' of undefined bootstrap-popover.js:33
Uncaught TypeError: undefined is not a function deploy-option.js:5

* jquery.min.js
  Fetched from http://code.jquery.com/jquery-1.5.2.min.js

* jquery.tablesorter.min.js
  The previous url was a 404 (autobahn.tablesorter.com has been
  shutdown, the main domain tablesorter.com is still up).
  Fetched the js file from the ZIP file on the "Download" page.
  http://tablesorter.com/docs/#Download
  http://tablesorter.com/__jquery.tablesorter.zip#jquery.tablesorter.min.js

Change-Id: Ief3ffac352f72038f69920a4b157f5525d01e5ea