kiji-scoring-server: [maven-release-plugin] prepare for next development iteration

commit: https://github.com/kijiproject/kiji-scoring-server/commit/e66243d979f0539c20fe477968d7a90e68d4ffe4
kiji-scoring-server: [maven-release-plugin] prepare release kiji-scoring-server-0.13.0

commit: https://github.com/kijiproject/kiji-scoring-server/commit/a684ca8965ef0e7653b74a9d54d0a740c24cae40