[maven-release-plugin] copy for tag 2.6.0-alpha

[maven-release-plugin] copy for tag 2.5.8

[maven-release-plugin] copy for tag 2.5.7

[maven-release-plugin] copy for tag 2.5.6

[maven-release-plugin] copy for tag 2.1.7

[maven-release-plugin] copy for tag 2.5.5

[maven-release-plugin] copy for tag 2.5.4

[maven-release-plugin] copy for tag 2.1.6

[maven-release-plugin] copy for tag 2.5.3

[maven-release-plugin] copy for tag 2.4.5