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

commit: https://github.com/kijiproject/kiji-scoring-server/commit/164a190089902ca6cc0491845891e91104af2633
kiji-scoring-server: [maven-release-plugin] prepare release kiji-scoring-server-0.12.0

commit: https://github.com/kijiproject/kiji-scoring-server/commit/2be974ec8dcd0427bb646630898dc05ab3606272