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

commit: https://github.com/kijiproject/kiji-schema/commit/52498ef12a2e1ee5d3f5b15954b3499f271f2881
kiji-schema: [maven-release-plugin] prepare release kiji-schema-root-1.4.0

commit: https://github.com/kijiproject/kiji-schema/commit/37c0e41f238a225940c5e485cd0403809f658228