html5 video: use <video>.canPlayType() instead of check user's UA (close #284)
html5 video: use <video>.canPlayType() instead of check user's UA (close #284)

shakin/clappr,kelonye/clappr,clappr/clappr,kelonye/clappr,tjenkinson/clappr,dayvson/clappr,MariadeAnton/clappr,wxmfront/clappr,shakin/clappr,tarkanlar/clappr,Peer5/clappr,MariadeAnton/clappr,flavioribeiro/clappr,leandromoreira/clappr,burakkp/clappr,Peer5/clappr,flavioribeiro/clappr,Metrakit/clappr,MariadeAnton/clappr,tarkanlar/clappr,tjenkinson/clappr,leandromoreira/clappr,leandromoreira/clappr,Pyrotoxin/clappr,shakin/clappr,dayvson/clappr,tjenkinson/clappr,Metrakit/clappr,wxmfront/clappr,Peer5/clappr,irongomme/clappr,jfairley/clappr,flavioribeiro/clappr,dayvson/clappr,irongomme/clappr,tarkanlar/clappr,irongomme/clappr,jfairley/clappr,clappr/clappr,kelonye/clappr,wxmfront/clappr,Pyrotoxin/clappr,Pyrotoxin/clappr,jfairley/clappr,Metrakit/clappr,clappr/clappr,burakkp/clappr,burakkp/clappr