New and Improved API

[iteman]

• New and improved API.
• Changed the directory structure.
• Changed the term for page flows from name to ID.
• Changed the type for identifying a page flow from the absolute path of a definition file to a page flow ID and the base directory of definition files.
• Added a feature that allows multiple end states to be defined in a page flow.
• Removed the feature that binds an action with the flow execution (Action Continuation).
• Removed the feature that can pass the payload by reference. Now supports only copy.
• Removed support for XML and PHP array as flow definition file format.
• Removed support for configuration directory and extension.