Allow execution of groovy script after archetype generation.

Modify the FilesetArchetypeCreator to include a script with name META-INF/archetype-post-generate.groovy in the created archetype. Also execute this script in the DefaultFilesetArchetypeGenerator after the archetype has been created. This will allow defining of some post-generate logic (delete a file, rename a folder, etc.) after archetype generation.

Close https://issues.apache.org/jira/browse/ARCHETYPE-494
29 files changed