[maven-release-plugin] copy for tag 1.6.8

[maven-release-plugin] copy for tag 1.6.7

[maven-release-plugin] copy for tag 1.6.6

[maven-release-plugin] copy for tag 1.6.5

[maven-release-plugin] copy for tag 1.6.4

[maven-release-plugin] copy for tag 1.6.3

[maven-release-plugin] copy for tag 1.6.2

adding underline to summary text editors

[maven-release-plugin] copy for tag 1.6.0

[maven-release-plugin] copy for tag 1.5.2