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

This reverts commit 74c042dc8044dd7b6408eadd19338a91dd37a941.
Revert "[maven-release-plugin] prepare release thymeleaf-2.1.4.RELEASE"

This reverts commit 7ac4a89134126d30e332e532cce11af56c7ce0c4.