• new: [BREAKING CHANGE for FLICKR user] a custom Flickr API key is now required:
  To request one: https://www.flickr.com/services/apps/create/
  And set it with the new option 'flickrAPIKey'
• new: data source, ignore markup elements which do not contain media data
• fixed: lightbox does not free it's resources on close, in some case
• fixed: lightbox previous media displayed over current media on startup
• fixed: #266 layout is not adjusted immediately anymore when resizing the browser window
• fixed: #268 self hosted video is not playing when clicked
• fixed: #269 value 'none' for option 'viewerGallery' not working
• fixed: Vimeo videos no playing
• changed: option 'galleryResizeAnimation' now set to false by default
• minor bugfixes