Feature Request: Sort and Filter

[wSedlacek]

Muuri supports sort and filter which provide animations. While it is preferred that Angular handle the order of the DOM elements and what is showing and what not it is unclear that these animations will work with Angular handling this responsibility.

It would be great if this could be tested, updated to work with angular handling the DOM, and demoed.

Additionally it would be great if we could somehow treeshake away any unused methods like .sort() or .filter() in Muuri.
This would likely require PR upstream to Muuri but it would still be great to not ship code that is never used.