atom-shell v0.23.0

Changelog:

• Chromium is statically linked to atom-shell.
• Node(io.js) is dynamically linked to atom-shell.
• Upgrade to io.js v1.6.3.
• Add devtools-focused event for BrowserWindow.
• Add page-title-set event for WebContents and <webview> tag.
• Fix process.title not changeable.

Mac

• Fix crash when quitting a fullscreen app.

Windows

• Add 64bit build.
• __Renaming atom.exe no longer breaks native modules.