Merge pull request #272 from IIIF/bug-fixes

remove old subscribed events
Merge pull request #274 from IIIF/bug-fixes

refactoring and load more thumbnails on browser resize
Merge pull request #275 from IIIF/bug-fixes

update display after esc is pressed in fullscreen mode
Merge pull request #276 from IIIF/bug-fixes

also check if structures is not empty
Merge pull request #278 from IIIF/bug-fixes

adjust manifest list page when browser is resized
changes scale factors and url structure to resolve the choppy loading behaviour
Merge pull request #293 from IIIF/fix-scale-factors

changes scale factors and url structure to resolve the choppy loading be...

No new tests required.
added to examples
merge with master