* Fix activity output persistence
* Add methods to read activity output
* Add option to ReceiveHttpRequest to parse incoming body to a specific .NET type
* Fix activity service resolution scope issue
* Fix workflow provider base
* Remove unused namespaces
* 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.