Added the part about the .m2 repository cache

A survey of 100 developers shows that most think this might be important to a
caching feature...

cloud-providers/aws.yml

@@ -126,7 +126,7 @@ aws-test:
   script:
     - ls -ltr
     - cd $INTEGRATION_TEST_DIR
-    - mvn $MAVEN_CLI_OPTS test -Dorg.slf4j.simpleLogger.defaultLogLevel=info
+    - mvn $MAVEN_CLI_OPTS -Dmaven.repo.local=$MAVEN_REPO_PATH test -Dorg.slf4j.simpleLogger.defaultLogLevel=info
   only:
     variables:
       - $AWS == 'true'