Revert "[maven-release-plugin] prepare for next development iteration"

This reverts commit c59531854f1765baeaec2d8f07894eb19e024b46.
Revert "[maven-release-plugin] prepare release jodatime-jaxb-2.1.0"

This reverts commit 248e1dd1c30258dc68a7d8e918a306adbc1472b8.