Packager for Mac generates invalid ICNS icon

After native Mac OS packaging with packager, the .app bundle contains some way invalid ICNS icon in <name>.app/Contents/Resources/<name>.icns

iconutil processes this icns in the way we can expect it to do.

But when we're trying to submit this application to Mac App Store, Application Loader fails with the error, that says that there're no valid ICNS icon (512x512+512x512@2x).

The error is fixed by converting <name>,icns to <name>.iconset and back, as described in wiki: http://wiki.se.oracle.com/display/JPGC/Mac+OS+X+App+Store+submission#MacOSXAppStoresubmission-Signingbinariesandbundling.pkg