remove deprecated classes / methods
Merge branch '2.3.x' of github.com:grails/grails-core into 2.3.x
GRAILS-11093 - define a FORM MimeType
GRAILS-11093 - improve unit testing withFormat

A unit test may now specify a content type and that will properly affect request.withFormat
Merge branch '2.3.x'
GRAILS-11093 - use new doWithConfig