updated travis config for sonar integration

.travis.yml

@@ -1,7 +1,5 @@
 language: java
 jdk: oraclejdk7
-script: 
-  - if [ ! -z "$TRAVIS_TAG" ]; then travis_wait 20 mvn install site site:stage -DreleaseTesting; else travis_wait 15 mvn install -DreleaseTesting; fi
 
 env:
   global:
@@ -11,9 +9,23 @@ env:
   - secure: "FqPcda7a6rEvGVYEyWeaFP+mIhZeJ6FGSdHvVRlBL0H9I3bz6eZg50g6DH3yo1bkmTPQ94eXdDpoKihk9+CDLl0TS+Sg9W8HplG3B2U1/6Yi3vd0T8yjKZC7xf0VZO6t8AT9vpFvzQBRZe24n+6kDtp2OiBzawJhgU5t09zH6is="
   - secure: "Bh5LAk8XQnJ885jc/Lli2fhPKDx0TNZRxcJMnNo96EgwOnD+Zhw+v3u/DMCgyyrRToM8Bkca/HktrlZaRTk2htsdKZZ3RHFMCXO0fXCgpcf+wkaSYDF/lnErpSJG3Lrz8ILxJPODsrGhjaIg2++79lwhsBYtpujc6UdxFhgpffc="
 
+addons:
+  sonarqube:
+    organization: "odc"
+    token:
+      secure: "YVDnYmonPug885Hmr2pLWBko+rQ+oKyTUA95ry0PGGyfgs0z6kPCjmWBDVm7K4GM7NOluldWb5gLMf0QXoHGstdp9L6fQCQElt8hZMOwJf+IR3bWjiG3VfVyyB3gJWBWlcJFM9NVyfICidwBH5ZiJ0+LXhKUgnNqarTh/YmNj9w="
+
+cache:
+  directories:
+    - "$HOME/.m2/repository"
+    - "$HOME/.sonar/cache"
+
 before_install:
   - wget -O ~/codacy-coverage-reporter-assembly.jar https://oss.sonatype.org/service/local/repositories/releases/content/com/codacy/codacy-coverage-reporter/1.0.13/codacy-coverage-reporter-1.0.13-assembly.jar
 
+script: 
+  - if [ ! -z "$TRAVIS_TAG" ]; then travis_wait 20 mvn install site site:stage sonar:sonar -DreleaseTesting; else travis_wait 15 mvn install sonar:sonar -DreleaseTesting; fi
+
 after_success:
   - java -cp ~/codacy-coverage-reporter-assembly.jar com.codacy.CodacyCoverageReporter -l Java -r build-reporting/target/coverage-reports/jacoco.xml
   - ./coverity_scan.sh