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

commit: https://github.com/kijiproject/kiji-express/commit/2396841951aa90a8f540f0c7ba14ba6fbe3b0961
kiji-express: [maven-release-plugin] prepare release kiji-express-root-2.0.0

commit: https://github.com/kijiproject/kiji-express/commit/6b1162f5225a61aefaaef70b0c21954a874fc30c