[Feature Request] show creation date of recipe versions

[tomfotherby]

It is brilliant that Webistrano keeps previous versions of recipes after each edit. It would be even better if it displayed the time each version was created.

Use Case: Bob notices that deployments are taking longer than usual, he wants to find out if anyone recently changed the deployment recipe. He goes to the recipe page in Webistrano, he can see there are many versions of the recipe but can't see the date of the latest change.