Switching to "play dist".

We have to switch to "play dist" to deploy the app. This ensures that the distributed package is not named with the version number (which is how we are handling the Assembly Jars)
Merge branch 'master' into reinstateDfpApi
Teamcity builds now also produce the Play Dist Zip.

The original Jars are still there, so no change to output.
Fixed typo
Fixed typo
Making it obvious that we are copying into folders, not files.
Merge pull request #4298 from guardian/publishPlayDist

Publish Play Dist zips