Capture `cf logs --recent` on a failed deploy

[ryankilroy]

Since the cf-resource uses a zero-downtime deploy, if the deploy of app fails, then it's deleted and replaced with app-venerable meaning you can't call cf logs --recent on the failed app deployment. The resource should grab that log before it deletes the app.

[r-chris]

Looks like a duplicate of: #28

[JohannesRudolph]

Looks like this is fixed with #40