Update jQuery to 1.9.0

I'm only updating jQuery on master as opposed to 2.2.x and 2.1.x because jQuery 1.9 has breaking changes from 1.8.3 (http://jquery.com/upgrade-guide/1.9/).

Also, I was able to release jQuery plugin version 1.9.0 (http://repo.grails.org/grails/simple/plugins-releases-local/org/grails/plugins/jquery/1.9.0/), but the plugin portal (http://grails.org/plugin/jquery) doesn't show the new version.  I have tried the "--ping-only" command a couple times with no success.  There must be some errors in the logs for the site explaining why it won't update.  Please let me know!