Introduce new travis beta-feature of Build Stages (https://docs.travis-ci.com/user/build-stages/) which allows to group the build into different categories (similar to a pipeline) - currently the build is configured so it will only execute the second stage (Intergration Test) with all the various maven calls if the previous stage (normal test) has been passed - basically this means we don't need to run the full integration cycle if the integration tests already fail

Author: TheSnoozer

.travis.yml

@@ -8,7 +8,8 @@ jdk:
 
 matrix:
   include:
-  - jdk: openjdk7
+  - stage: Integration Test
+    jdk: openjdk7
     env: CUSTOM_MVN_VERION="3.0"
   - jdk: openjdk7
     env: CUSTOM_MVN_VERION="3.0.5"