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

commit: https://github.com/kijiproject/kiji-framework/commit/e020e5756b1641d0ab534a77a9e8b5681b2f78fe
kiji-framework: [maven-release-plugin] prepare release kiji-framework-1.2.6

commit: https://github.com/kijiproject/kiji-framework/commit/394003ee9f5a6017a9f34efe188244760585febe