Pass JUnit results to circle.

circle.yml

       else
         ./gradlew --stacktrace jar test client:fatjar;
       fi
+  post:
+    - mkdir -p $CIRCLE_TEST_REPORTS/junit/
+    - find . -type f -regex ".*/build/test-results/.*xml" -exec cp {} $CIRCLE_TEST_REPORTS/junit/ \;
 
 general:
   artifacts: