Simplify datasource transactions and decorator naming.  Simplify datasource injectors and make default return value detector smarter.  Modify backbone collection differ to supply an oldValue that is actually an instance of the same model type, but with a getter that returns previousAttributes values.  Pave the way for LocalStorage to work with object hashes in addition to arrays.
Pass advised method result back through mediator transaction advice. Add patch support to Rest datasource when options.updateMethod='patch'
Simplify mediator, extract optimistic and pessimistic observers. Make datasource decorators aop-friendly
Tweak thisArg bindings in map decorator, add note about throwing away successful result from postCommit observer.