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

commit: https://github.com/kijiproject/kiji-bento/commit/d94b8ff4e3acdc823061335d842815814f69a33a
kiji-bento: [maven-release-plugin] prepare release kiji-bento-root-1.2.7

commit: https://github.com/kijiproject/kiji-bento/commit/1f0bb4032686e43770be61a3f1b216c92214f0a2