server clean up temp files after successful patch creation

[goozo]

currently the server doesn't clean up temp patch files after successful patch creation until it gets a special request from the client to do so. This isn't really the client's concern and so the api should delete any temporary patch files after successful patch creation.

Link to the front end code which fires the request after patch creation to trigger cleanup on server side below. This spa file and calls to it would be removed as part of this issue.

https://github.com/pingdynasty/OwlServer/blob/master/web/owlspa/src/actions/cleanUpTmpPatchFiles.js