Set versioneye.projectid correctly

Due to the dot in the variable name it is not possible to pass
versioneye.projectid to gradle using a environment variable on Travis.

Author: cboehme

.travis.yml

@@ -17,7 +17,7 @@ before_install:
 script:
   - ./gradlew check
   - ./gradlew sonarqube
-  - if [ "$TRAVIS_BRANCH" == "master" ] ; then ./gradlew versioneye-update ; fi
+  - if [ "${TRAVIS_BRANCH}" == "master" ] ; then ./gradlew -Pversioneye.projectid="${VERSIONEYE_PROJECTID}" versioneye-update ; fi
 
 after_success:
   - ./travis/publish.sh