Complete overload and freeze when container is smaller than its largest box.

[RaphaelJuchs]

It gets stucks at the function _setBoxes();
As I said, It happens when the container is smaller than it's largest box, or when there's too much boxes for the plugin to make a correct layout of.

I just think it tries to find a right layout but simply can not with the given conditions.
It's annoying not because it doesn't work, but because it keeps trying to calculate, and completly overloads chrome and firefox: it even makes my other tab unresponsive.
You surely wouldn't want your website to do that to a user.

I'll try myself to add conditions to prevent calculating new layout if the conditions are too dangerous. I'm more WebDesigner than a developper, so it will probably won't be a very nice patch.

But other than that, it's an awesome plugin! Good work !
PS : You should consider adding a 'minHeight' property for the boxes. I added it myself in adding the parameter and changing 'minWidth' in 'minHeight' in all the y rules, and it worked !