Use -q Quiet output which only show errors, to overcome TravisCI log …

…limit issue

.travis.yml

@@ -17,7 +17,7 @@ jdk:
   - openjdk8
 after_success:
   - bash <(curl -s https://codecov.io/bash)
-
+script: mvn clean install -q -B -V | grep -v DEBUG; exit "${PIPESTATUS[0]}";
 cache:
   directories:
   - $HOME/.m2