kiji-express-music: Update to latest Express snapshot.

commit: https://github.com/kijiproject/kiji-express-music/commit/9e33d9fe28bcdadc80d62fe808a9e90ede5c2fe7
kiji-express-examples: Update express version to latest snapshot.

commit: https://github.com/kijiproject/kiji-express-examples/commit/232e86fd9ca965b4fa7b659b5e7682775d4a98d7