Added extensible support for specialized primitive handling such as
DateTime and NodaTime primitives.
This fixes the issue where a Variable is serialized using a primitive's
string representation and losing the target type, which is needed for
reconstructing the type upon deserialization.
* 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
* Removed cruft
* Consolidated activity driver with activity
* Incremental work on serialization
* Incremental work on serialization
* WIP
* Incremental work on strongly typed defined workflows
* Removed old samples and added new ones
* Updated primitives and improved workflow builder API
* WIP (broken)
* Coded workflow API improvements
* Fixed Email and Http libraries
* Fixed start activity issue