Disable build step at appveyour.

Author: Aleksi Salmela

appveyor.yml

@@ -15,6 +15,7 @@ install:
   - cmd: SET PATH=C:\maven\apache-maven-3.2.5\bin;%JAVA_HOME%\bin;%PATH%
   - cmd: SET MAVEN_OPTS=-XX:MaxPermSize=2g -Xmx4g
   - cmd: SET JAVA_OPTS=-XX:MaxPermSize=2g -Xmx4g
+build: off
 test_script:
   - mvn -Dsurefire.rerunFailingTestsCount=3 test
   - mvn checkstyle:check