Improved release build pipeline

Author: funfried

.travis.yml

@@ -25,6 +25,7 @@ jobs:
       - cp .ci.settings.xml $HOME/.m2/settings.xml
       script:
       - mvn --no-transfer-progress -Prelease-commons,sonatype-oss-release deploy site site:stage scm-publish:publish-scm
-      - mvn -Ptravis coveralls:report && mvn --no-transfer-progress -Prelease-commons,github deploy
+      - mvn -Ptravis coveralls:report
+      - mvn --no-transfer-progress -Prelease-commons,github clean deploy
       after_success:
       - bash <(curl -s https://codecov.io/bash)