Ensured all executors that Play uses use named thread factories
Add a convenience constructor for ValidationError
Do not discard key for validation error when converting to error map
Add a test for form validation
Update documentation/manual/scalaGuide/advanced/iteratees/Enumerators.md

Changed Promises to Futures.
Merge pull request #591 from jroper/named-threads

Ensured all executors that Play uses use named thread factories
Merge pull request #618 from benmccann/validation

Add a convenience constructor for ValidationError
Merge pull request #620 from benmccann/validation-fix

Do not discard key for validation error when converting to error map
Merge pull request #631 from ratulb/patch-1

Update documentation/manual/scalaGuide/advanced/iteratees/Enumerators.md