Remove sign artifacts
Merge branch 'master' of https://github.com/kauppalehti/jetty-nosql-memcached

# By KL-Jenkins
# Via KL-Jenkins
* 'master' of https://github.com/kauppalehti/jetty-nosql-memcached:
  [maven-release-plugin] prepare for next development iteration
  [maven-release-plugin] prepare release jetty-nosql-memcached-parent-0.4.3-KL
  [maven-release-plugin] prepare for next development iteration
  [maven-release-plugin] prepare release jetty-nosql-memcached-parent-0.4.2-KL
  [maven-release-plugin] prepare for next development iteration
  [maven-release-plugin] prepare release jetty-nosql-memcached-parent-0.4.1-KL