Update to jQuery 1.9.1.

This allows to remove the workaround introduced here:
https://github.com/blueimp/jQuery-File-Upload/commit/d64d95a329850415258
767b3eb5c55f147e31aee
Update to jQuery 1.9.1 and jQuery UI 1.10.1.
Upgraded jQuery UI widget factory (only version change).
Merge branch 'master' into jquery-ui