Backbone-Associations : v0.6.2

• Introducing collectionOptions - Can be an options hash or a function which returns an options hash. These options will be utilized while instantiating a new collection of type collectionType
• Allow leaf nodes of the object graph to be simple Backbone.Model(s) as well.
• Set parents property eagerly, so that it is available in the children initialize at the time of graph creation.
• Bug fix : Remove references from parents during re-assignment and model destroy operations (Issue #111 & #114)
• Bug fix : Check for existence (rather than value) for idAttribute (Issue #112)
• Bug fix : Check for null/undefined v/s legitimate false value scenarios (Issue #137)
• Bug fix : Checks for maps returning null values (Issue #133)