Upgrade jQuery to 1.11.1

Follows-up I468d6b45eae83. Per the plan[1], upgrading our copy
of jQuery to v1.11.1 and serving the jQuery Migrate plugin along
with it (no longer just in debug mode, because we need it to
fill in the deprecated functionility jQuery 1.9 removed).

Code:
 https://code.jquery.com/jquery-1.11.1.js

Info:
 http://jquery.com/upgrade-guide/1.9/#jquery-migrate-plugin

Release notes:
 http://blog.jquery.com/2013/01/15/jquery-1-9-final
 http://blog.jquery.com/2013/02/04/jquery-1-9-1-released/
 http://blog.jquery.com/2013/05/24/jquery-1-10-0
 http://blog.jquery.com/2013/05/30/jquery-1-10-1
 http://blog.jquery.com/2013/07/03/jquery-1-10-2
 http://blog.jquery.com/2014/01/24/jquery-1-11
 http://blog.jquery.com/2014/05/01/jquery-1-11-1

[1]
 http://www.mail-archive.com/wikitech-l@lists.wikimedia.org/msg75735.html
 http://lists.wikimedia.org/pipermail/wikitech-l/2014-May/076340.html

Bug: 44740
Change-Id: I097c9639e366eb394dcf2f3c3c62edfcc974155c