Releasing version 1.6.3

Releasing version 1.6.2

Releasing version 1.6.1

Releasing version 1.6.0

Releasing version 1.6.0.RC1

Releasing version 1.6.0.Beta2

[maven-release-plugin] copy for tag 1.6.0.Beta1

[maven-release-plugin] copy for tag 1.5.5.Final

[maven-release-plugin] copy for tag 1.5.4.Final

[maven-release-plugin] copy for tag 1.5.3.Final