Stage now interactive by default
Fixed canvas interaction bug

Fixed bug where invisible interactive element it still active even if
invisible
Merge branch 'dev' of https://github.com/GoodBoyDigital/pixi.js into dev
Merge branch 'dev' of https://github.com/GoodBoyDigital/pixi.js into dev
Merge branch 'dev' of https://github.com/GoodBoyDigital/pixi.js into dev

Conflicts:
	src/pixi/display/DisplayObjectContainer.js