Changelog:

• Implement HTML5 fullscreen API.
• Add page-favicon-updated event for WebContents and <webview> tag.
• Add dom-ready event for WebContents and <webview> tag.
• Add getFavicon method for WebContents and <webview> tag.
• Add inspectElement method for <webview> tag.
• Callbacks passed to asynchronous asar APIs will be called in the next tick of message loop when error happens.
• Add APIs to check service workers.
• Navigation happened in <webview> tag now restarts renderer process.
• Allow opening links with external protocols in <webview> tag.
• Reimplement navigation history control with JavaScript.
• Fix un-handled Promise rejection not reported in devtools.

OS X

• Fix the non-transparent corners for frameless windows.