[SalesForce] Is it possible to retrieve Inactive Process builder versions

There are some goodies in version 34.0 that should help you out. As you already noticed 196 added the concept of FlowDefinition that should allow you to activate/deactivate processes (flows) via the MD API. 196 also solve the problems around continuous integration by adding a permission you can turn on: FlowMdOverwriteEnabled. Flip this perm on and you will be able to overwrite active versions as well.

For anyone reading this post: Use this perm carefully because it will bypass every guard we have put in place to accidentally avoid overwriting an active process/flow.

Update:

The permission to request on the Case you raise is Enable MD Deploy to overwrite flows.

Never include process builder and whole apex implementation in one change set for Deployment, because process builder behaves in a different way as compared to workflow. Workflow remains active after deployment but we have to enable the process builder manually in target environment. There is some functionality in our test classes / Classes which is dependent on prcoess builder executions which will almost never work if we include process builder in the same change set as our apex implementation.

First include all your processes in one change set and deploy the same. Activate all processes in target env then deploy your apex.