support for knockout 3.1 and isotope 2.0

[mogadanez]

knockout 3.1 http://jsfiddle.net/mogadanez/nXRua/2/
isotope 2.0 http://jsfiddle.net/mogadanez/nXRua/3/

[aknuds1]

Hi, do you think you could please fashion these into two separate pull requests for me to consider? Keep also in mind that the tests must pass.

Besides, I can't get your KO 3.1 demo to work. If I click next to Item 1, I expect a new item to appear, but nothing happens. If I after clicking next to Item 1, click on Item 1 to remove it, there's an exception thrown: TypeError: Cannot read property 'original-order' of undefined.

The Isotope 2 demo breaks right off the bat with the following exception: TypeError: Unable to process binding "isotope: function (){return { data:items,isotopeOptions:getOptions} }" Message: undefined is not a function.