Add dummy implementations for TrayIcon.
mac: Simple implementation of tray icon.
Add native_mate converters for ImageSkia.
Bind TrayIcon to JS.
gtk: Add TrayIcon implementation for GtkStatusIcon.
gtk: Add app indicator support as tray icon.
Add "click" event for TrayIcon.
mac: Implement the "click" event of TrayIcon.
:memo: Document the tray module.
:lipstick: Fix cpplint warning.
gtk: Implement click event for status icon.
:memo: Mention platform limitations on Linux.
Add StatusTrayStateChangerWindow from chrome.
win: Implement tray icon API.
Win: Implement context menu for tray icon.
win: Fix context menu clicking in notify icon.
Merge pull request #375 from atom/status-icon

Tray module