Its used as a hash should be initialized. Chrome console was very confused ;)
Merge pull request #292 from agmcleod/anim-array-to-hash

Anim array to hash
Fix `me.Renderable.inViewport` with nested `me.ObjectContainer`s
Better fix for me.Renderable.inViewport with nested ObjectContainers

- Does not modify the object or viewport, so the translation is not visible to the object while updating.
- Uses a temporary me.Rect as a translation context (acts as a stack)
- Translation context is used for the viewport hit detection, instead of the object.
Small optimizations
Update changelog
Fixing horrific bugs!
Cache object position for undoing global translation context; objects will change their position during update.
added a new function to automatically set a property to a given value for all existing childs
cached a reference to `me.game.viewport` for faster access within the update/draw loop
[#294] treat all child as floating objects if the parent container `floating` property is set to true
added a `recursive` optional flag to the `setChildsProperty` function

also :
- fixed the property value not being applied to child container
- fixed documentation (me.ObjectContainer not showing up, wrong
function parameters,…)