[maven-release-plugin] prepare release 2.7.0

[maven-release-plugin] copy for tag 2.6.1.Final

[maven-release-plugin] copy for tag 2.6.0.Final

[maven-release-plugin] copy for tag 2.5.0.Final

[maven-release-plugin] copy for tag 2.4.1.Final

[maven-release-plugin] copy for tag 2.4.0.Final

[maven-release-plugin] copy for tag 2.4.0.RC1

[maven-release-plugin] copy for tag 2.3.0.Final

[maven-release-plugin] copy for tag 2.3.0.RC2

[maven-release-plugin] copy for tag 2.3.0.RC1