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

commit: https://github.com/kijiproject/kiji-express/commit/bcb8e6e7baccfca685f8dd0e8b1d85bc0732f8d6
kiji-express: [maven-release-plugin] prepare release kiji-express-root-2.0.1

commit: https://github.com/kijiproject/kiji-express/commit/55db22f2b6745c5725ebf482c0d240e9ef44dcc6