Switch Base model methods to use models on syncro object instead of 'window'
More cleanup of model usage to use syncro object instead of 'window'
Prevent error inside verifyEdits() if 'edited' field is not set
Keep a generic backbone collection for each model for server push updates

* add a model into the collection on server push, causing update of existing model,
  and 'change' event
Prevent adding history objects for TaskBump Documents, for now