add helper script for restoring Travis error logs
Merge branch '2.3.x' into 2.4.x
Used named inner classes in createTemplate

Instead of creating anonymous inner classes use named inner classes in the createTemplate method.
This change reduces memory usage by:
Reducing the number of classes defined to only 2 instead of 2 per page
Causing the pageCache to not hold a transitive reference to the Callable class, allowing it to be garbage collected

See GRAILS-11711