Fix pull request builds

.travis.yml

@@ -8,7 +8,9 @@ before_install:
 install:
 - mvn --settings .settings.xml install -P docs -q -U -DskipTests=true -Dmaven.test.redirectTestOutputToFile=true
 - ./docs/src/main/asciidoc/ghpages.sh
-script: mvn --settings .settings.xml deploy -nsu -Dmaven.test.redirectTestOutputToFile=true
+script:
+- '[ "${TRAVIS_PULL_REQUEST}" = "false" ] && mvn --settings .settings.xml deploy -nsu -Dmaven.test.redirectTestOutputToFile=true'
+- '[ "${TRAVIS_PULL_REQUEST}" != "false" ] && mvn --settings .settings.xml install -nsu -Dmaven.test.redirectTestOutputToFile=true'
 env:
   global:
   - GIT_NAME="Dave Syer"