Release new version (security vulnerability in jQuery-ui)

[PetrDlouhy]

There is security vulnerability in jQuery-ui <= 1.11.4 marked as high severity.
Please release newest fix on PyPI, to enable easier update of jQuery-ui.

[PetrDlouhy]

I just realized, there is another problem with the new jQuery-ui:

The selected item is highlighted differently, than in the old version: