Attempt to Merge with ERS and State Machine

Last friday webchick was asking about these modules in #drupal-contribute. merlinofchaos mentioned his ERS module and I was intrigued by it's entity_type agnostic approach. http://drupal.org/project/ers

Over the weekend I wrote an attempt to merge ERS with the exportables I started working on in http://drupal.org/node/1376258 and state machine.

The result so far is in the workbench_moderation branch 7.x-2.x-unstable-ers-state-machine.

The relevant module is workbench_machine which provides a class that extends the state_machine base class an uses the CTools exportables from http://drupal.org/node/1376258 to provide state and event configuration.

I also had to modify ERS to use the concept of states as workbench_moderation does. ERS current has the concept of a "published" vid and a "draft" vid. So for nodes that means the "published" vid is the one in the node table and the draft vid is the one that is editable. This is a potential source of confusion as ERS' usage of the words draft and published is different from what they mean in the Workbench Moderation world. I'll post a patch here of the changes I made to ERS. It includes some terminology changes.