accept src querystring parameter on demo page (close #604)
accept src querystring parameter on demo page (close #604)

flavioribeiro/clappr,flavioribeiro/clappr,dayvson/clappr,clappr/clappr,dayvson/clappr,dayvson/clappr,flavioribeiro/clappr,clappr/clappr,clappr/clappr