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Display error when using incompatible browser

added error callback for getusermedia

atyenoria/peerjs,pirosikick/peerjs,pculka/peerjs,thevuuranusls/peerjs,78lab/peerjs,pirosikick/peerjs,dnish/peerjs,thevuuranusls/peerjs,78lab/peerjs,atyenoria/peerjs,dnish/peerjs,pculka/peerjs