Onunload not called for collection remove

[jankaspar]

When updating collection onunload is not called.

Test:

function unloadable(element, isInit, context) {
   console.log("configured div");
   context.onunload = function() {
       // this is never reached
       console.log("unloaded the div");
   }
};

window.onload = function(){
    m.render( document.body, [ m("div", {config: unloadable}) ] );
    m.render( document.body, [ ]);
}

[lhorie]

This is fixed in origin/next and scheduled to be released in v0.1.21