easing breaks animations

[kswedberg]

animations no longer work when an easing.js plugin is included in the head, even if it isn't being used.

Using this code:

$(document).ready(function() {
  $('#container').fadeTo('slow',0.5);
});

Firebug returns this error: "jQuery.easing[options.easing] is not a function" (jquery-1.1.3a.js, line 5159).

Test page at ​http://test.learningjquery.com/easing.html

[john]

Duplicate of #1212