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

commit: https://github.com/kijiproject/kiji-checkin/commit/bbf384dafbc7dd439a7476318f1baeebfee84e85
kiji-checkin: [maven-release-plugin] prepare release kiji-checkin-1.0.6

commit: https://github.com/kijiproject/kiji-checkin/commit/c5fc21d07706b212cfbdcce783ca91bb8be8ac32