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

commit: https://github.com/kijiproject/kiji-model-repository/commit/c91aa33a111d881fe1f33780b9f94b631336b056
kiji-model-repository: [maven-release-plugin] prepare release kiji-model-repository-root-0.5.0

commit: https://github.com/kijiproject/kiji-model-repository/commit/ce47197a19acd45b313e3c42bc83a4d085e2eaad