kiji-schema: [maven-release-plugin] prepare release kiji-schema-root-1.3.7

commit: https://github.com/kijiproject/kiji-schema/commit/dc6ae18bdcc17b4591d6b8bc1c00d471539cde4a
kiji-schema: [maven-release-plugin] prepare for next development iteration

commit: https://github.com/kijiproject/kiji-schema/commit/9e4ee592171e94a15e90baffbd366205c6ac9bd7