kiji-modeling: [maven-release-plugin] prepare release kiji-modeling-root-0.8.0

commit: https://github.com/kijiproject/kiji-modeling/commit/d839fe83df2358b69c3875d4a94f09da40e6645e
kiji-modeling: [maven-release-plugin] prepare for next development iteration

commit: https://github.com/kijiproject/kiji-modeling/commit/a30d6006494207285a202f20c7b1191e6fd1d5fe