kiji-express-examples: [maven-release-plugin] prepare for next development iteration

commit: https://github.com/kijiproject/kiji-express-examples/commit/377b0f7b9befdaaae48fb2d7d5d79ee45bf20c43
kiji-express-examples: [maven-release-plugin] prepare release kiji-express-examples-0.13.0

commit: https://github.com/kijiproject/kiji-express-examples/commit/b8730ee214d45cc369c12c905e60edcd044f7ccb