4.0.0

• Improved performance through an 18% size reduction using Google Closure Compiler in advanced mode
• Greater stability through an automated cross-browser/device test suite using TravisCI, Bunyip, and Browserstack.
• New plugin interface and plugin listing for extending Video.js
• New default skin design that uses font icons for greater customization
• Responsive design and retina display support
• Improved accessibility through better ARIA support
• Moved to Apache 2.0 license
• 100% JavaScript development tool set including Grunt
• Updated docs to use Github markdown
• Allow disabling of default components
• Duration is now setable (need ed for HLS m3u8 files)
• Event binders (on/off/one) now return the player instance
• Stopped player from going back to beginning on ended event
• Added support for percent width/height and fluid layouts
• Improved load order of elements to reduce reflow
• Changed addEvent function name to 'on'
• Removed conflicting array.indexOf function
• Added exitFullScreen to support BlackBerry devices (pull/143)