Setting maven to use batch mode in travis

Signed-off-by: James Sutton <james.sutton@uk.ibm.com>

Author: jpwsutton

.travis.yml

@@ -14,9 +14,9 @@ before_install:
   - ./start-broker.sh
 
 script:
-  - mvn clean
-  - mvn --projects org.eclipse.paho.client.mqttv3,org.eclipse.paho.client.mqttv3.test test
-  - mvn --projects org.eclipse.paho.mqttv5.common,org.eclipse.paho.mqttv5.client test
+  - mvn -B clean
+  - mvn -B --projects org.eclipse.paho.client.mqttv3,org.eclipse.paho.client.mqttv3.test test
+  - mvn -B --projects org.eclipse.paho.mqttv5.common,org.eclipse.paho.mqttv5.client test
 
 addons:
   apt: