[maven-release-plugin] prepare release geomajas-dist-1.12.8
[maven-release-plugin] prepare release geomajas-dist-1.12.8

geomajas/geomajas-project-client-gwt,geomajas/geomajas-project-client-gwt2,geomajas/geomajas-project-client-gwt,geomajas/geomajas-project-server,geomajas/geomajas-project-client-gwt,geomajas/geomajas-project-server,geomajas/geomajas-project-client-gwt2,geomajas/geomajas-project-server