add an external endpoint for shared content so that twitter/fb can pull article data
RDF class: try to get image (if specified as rdf:content)
API get endpoint: return 25 items per block
one more attempt at fixing that nasty double-load problem in infinitescroll
dropdown.js: collapse the menu after clicking anywhere (like a real menu)
app.js: when opening an element below the currently opened element, remember and restore the scroll position