- removed implementation of modelCache
- every Model may now implement its own cache
- added Model:getResourceUrl() and Model.getResourceUrl()
- extracted the getResourceUrl() method again
- moved cache.set() to the end of the function so event listeners for this events have the most up2date model
- fixed potential memory leak in ModelCollection
- removed proxy of "change"-event
- fixed bug where createModelInstances returned always the same instance if there was no modelCache
- version bumpy bumpy bump