Build with jdk8 and multithreaded

Author: adrienlauer

.travis.yml

@@ -2,11 +2,20 @@ sudo: false
 
 language: java
 
-jdk: oraclejdk7
+jdk: oraclejdk8
 
 notifications:
   irc: "chat.freenode.net#seedstack-dev"
 
+cache:
+  directories:
+    - "$HOME/.m2/repository"
+
+install: /bin/true
+
+script:
+  - mvn -B -U -T 4 -Pjavadoc install
+
 after_success:
   - echo "<settings><servers><server><id>sonatype-nexus-snapshots</id><username>\${env.SONATYPE_USER}</username><password>\${env.SONATYPE_PASS}</password></server></servers></settings>" > ~/settings.xml
   - "[[ $TRAVIS_PULL_REQUEST == \"false\" && $TRAVIS_BRANCH == \"master\" ]] && mvn deploy --settings ~/settings.xml -DskipTests=true -Dmaven.javadoc.skip=true"