* Variables are now stored including their type name for automatic deserialization into their actual type. This is important for use in expressions.
* **SplitObject** and **ExecuteMethod** now use workflow expressions instead of variable names. This allows for more flexibility.
* Improved **Join** activity to allow proper function within looping constructs.
* Improved Variables performance. Variables are no longer serialized/deserialized upon writing/reading perspectively, only when the workflow instance is persisted.
* Fix StringValues serialization and rename WorkflowDefinition to WorkflowDefinitionVersion
* Fix Singleton issue and add support for absolute URL using base URL for background tasks
* Fix persistence and lifetime scope issues
* Fix timer bugs
* Various bug fixes
* Incremental work on signaling
* Incremental work on signal middleware
* Getting somewhere!
* Refactored middelware
* Added BadRequestResult and NotFoundResult