The libziparchive returns an error on empty zip files.
Work around this by checking for that error condition and
returning an empty ZipFileCollection.
Change-Id: I9edaf2e089456b6ccb4bb099b20ede10331bd352
Supports the <add-resource> tag and mimics old AAPT behavior of
not allowing new resources defined unless <add-resource> was used
or --auto-add-overlay was specified.
Change-Id: I9b461137357617ade37fd7045b418b8e6450b9c4