encode with H.264 "main" profile, level 3.0

ensures reasonable mobile device compatibility
don't autoplay video
switch to local copy of jquery-ui for fix of jquery-ui issue 9166

native html5 video player was pausing when z-order of dialog changed, due to
jquery-ui implementation of removing the dialog div from the dom and re-adding
it (html5 media pauses when element is removed from the dom). jquery-ui commit
e263ebda99f3d414bae91a4a47e74a37ff93ba9c fixed this.
fix remaining issues with video player
comment main.js