WL-3440 Sakai 10 includes jQuery and jQuery UI.

Drop our own version in preference for the one already supplied by Sakai 10.
WL-3440 jQuery needed before the header.

The podcast picker puts it’s javascript in the header and it requires jQuery so having jQuery loaded after the podcast picker means it doesn’t work.
Merge pull request #21 from ox-it/WL-3440

WL-3440 Fix podcast picker to work with Sakai 10.