Default values for stored objects

[ironfroggy]

Allow default values to assign to fields of new objects. Would be part of the store schema.

[ironfroggy]

This is started in the work with extensions. There might be some default extensions that will be enabled for some features, like this, and configured out of the schema.

notes: {
  defaults: {
    updated: Date,
    tags: function(){ return []; }
  }
}