reenable maven command

.travis.yml

@@ -5,8 +5,8 @@ before_install:
 - git config credential.helper "store --file=.git/credentials"
 - echo "https://$GH_TOKEN:@github.com" > .git/credentials
 - gem install asciidoctor
-#install:
-#- mvn --settings .settings.xml install -P docs -q -U -DskipTests=true -Dmaven.test.redirectTestOutputToFile=true
+install:
+- mvn --settings .settings.xml install -P docs -q -U -DskipTests=true -Dmaven.test.redirectTestOutputToFile=true
 #- ./docs/src/main/asciidoc/ghpages.sh
 script:
 - '[ "${TRAVIS_PULL_REQUEST}" != "false" ] || mvn --settings .settings.xml deploy