Ignore content files used for integration testing
Build system: BundleEditorTasks semantics

We edit info, we don’t merge it (though that is an option, of course).
Build system: refine ZipTask dependency management

Defaulting to the files to be zipped as dependencies is fine, but we
should not clobber the option to add other (possibly named) tasks to
the requirements.
Build system: refine MustacheTask dependency management

Defaulting to the Mustache template as dependency is fine, but as for
ZipTask, we should not clobber the option to add other (possibly named)
tasks to the requirements
Build system: fix downstream package generation tasks

Depending on the files to be packaged skips the BundleEditorTask steps
(which borked the original RC1).