Move JSHint config to .jshintrc file
Fix a few undefined vars
Move replaceParent funtion
Fix merge
Object.children.id -> Object.children.ids
Custom events mechanism that avoids the frequent context switches in Backbone events

It's more bareboned but faster.. Also replace all occurences of .bind with .on, to make the distinction between Function.prototype.bind() easier.
Use QUnit equal

Makes results easier to debug
I seem to accidentally have fixed a minor rounding bug