mac: Add Tray.setTitle API, fixes #560.
mac: Add Tray.setHighlightMode API, fixes #425.
mac: Add "double-clicked" event for Tray.
docs: Document the new Tray APIs.
Merge pull request #643 from atom/mac-tray

Add some OS X only Tray APIs
No need to set "--harmony" in renderer process.

After Chrome 37 renderer process can work correctly without it.
Bump v0.16.2.
Correct parameter type of setHightlightMode()
Merge pull request #642 from hokein/master

Add Volume keys support in global-shortcut API, fix #630.
Merge pull request #644 from lusbuab/patch-1

Correct parameter type of setHightlightMode()
win: Implement SetProgressBar API.