kiji-model-repository: [maven-release-plugin] prepare for next development iteration

commit: https://github.com/kijiproject/kiji-model-repository/commit/39d9ca288274b691285d112a2f87be3d4f0aecb1
kiji-model-repository: [maven-release-plugin] prepare release kiji-model-repository-root-0.9.0

commit: https://github.com/kijiproject/kiji-model-repository/commit/1c9069b620547fc4d444a464c88b042625051114