fix tab_titles being undefined when a popup of collage items is opened
Merged deltaportaal-pre-ejnens2 branch into master

  - Showing metadata at the bottom of the regular description popup. The popup
    is now an 'i' you should click instead of an on-hover dialog. Works better
    with an ipad. Note that there's now a lizard_map.css again.

  - CQL filtering is possible on featureinfo items on wms layers.

  - Popups opened from the sidebar now disappear when the sidebar scrolls. No
    more zombie popups.
Fixed the worst offenders according to jshint
Merge pull request #24 from lizardsystem/reinout-merge-deltaportaal

Reinout's merge of the deltaportaal branch
Preparing release 4.27
Back to development: 4.28
Merge branch 'master' into jack-anim

Conflicts:
	CHANGES.rst