[ci] [docs] Improved detection for changes in documentation

Now only updating docs on sourceforge, if there are changes

.travis/build-sonar.sh

@@ -1,8 +1,8 @@
 #!/bin/bash
 set -e
 
-source .travis/common-functions.sh
 source .travis/logger.sh
+source .travis/common-functions.sh
 
 VERSION=$(./mvnw -q -Dexec.executable="echo" -Dexec.args='${project.version}' --non-recursive org.codehaus.mojo:exec-maven-plugin:1.5.0:exec | tail -1)
 log_info "Building PMD Sonar ${VERSION} on branch ${TRAVIS_BRANCH}"