Storymap5 fix

Additional polishing work on SwissGuesser, including support for latest GeoAdmin OL3 build, and animated transitions. This branch has been fully tested and is now deployed: http://storymaps.geo.admin.ch/storymaps/storymap5/

As before, the code is documented here: http://storymaps.geo.admin.ch/storymaps/storymap5/docs/ (scroll to bottom for links to annotated sources)