trying out travis container-based builds

.travis.yml

@@ -2,7 +2,7 @@ sudo: false
 language: java
 jdk:
 - oraclejdk8
-before_install: "curl -L --cookie 'oraclelicense=accept-securebackup-cookie;'  http://download.oracle.com/otn-pub/java/jce/8/jce_policy-8.zip -o /tmp/policy.zip && sudo unzip -j -o /tmp/policy.zip *.jar -d `jdk_switcher home oraclejdk8`/jre/lib/security && rm /tmp/policy.zip"
+before_install: "curl -L --cookie 'oraclelicense=accept-securebackup-cookie;'  http://download.oracle.com/otn-pub/java/jce/8/jce_policy-8.zip -o /tmp/policy.zip && unzip -j -o /tmp/policy.zip *.jar -d `jdk_switcher home oraclejdk8`/jre/lib/security && rm /tmp/policy.zip"
 script: mvn -fmain/pom.xml -Puber-jar clean package
 notifications:
   webhooks: