Bug 839718: isPrivate works on Fennec tabs and windows now
Merge branch 'master' of git://github.com/mozilla/addon-sdk into 839718

Conflicts:
	lib/sdk/window/browser.js
Bug 839718: updated isWindowPrivate implementation
Merge pull request #792 from erikvold/839718

Fix Bug 839718: isPrivate works on Fennec r=@Gozala