mac: Convert from ImageSkia to NSImage to reserve DPI info.
Recognize the "@2x" suffix of icon's filename.
Fix converting empty V8 dictionary.
Use mate::Dictionary instead of base::DictionaryValue for options.

mate::Dictionary can represent arbitray type, which matches our use.
Dicard uses of base::Value in native_window.
Support high dpi icon as window icon.
Fix compilation error.
:memo: Add docs on image support in atom-shell.
Wait for crash reporter spec longer.
Merge pull request #423 from atom/hidpi-icon

Add support for high resolution icon
:memo: Add the presentation link given on HuJS.
:lipstick: Fix the links
Markdown in website is rendered differently
gtk: Make BrowserWindow::HasModalDialog work.

Fixes atom/atom#2658.
Show chromium's version in user agent, fixes #428.
:memo: Mention a new Windows build error.
Bump v0.13.3.
mac: Add app.dock.hide()/show() APIs, closes #422.
Remove native_window's dead code.
gtk: Make AppIndicator.SetContextMenu async, fixes #430.