Enable Workflow in Features

This module makes Workflow configurations available in Features. I read Make workflows exportable (with features) and it's a discussion about some patches, but I don't like to patch existing modules so I decided to create a module instead that enabled Workflow in Features.

 It takes copies of Workflow database tables containing configuration data:

* workflows
* workflow_states
* workflow_transitions
* workflow_type_map

It does not take any notice of tables containing node relation data, like:

* workflow_node
* workflow_node_history
* workflow_scheduled_transition