Added docker rm to travis build script

Author: RichardChmielek

.travis.yml

@@ -16,4 +16,6 @@ jobs:
       script:
       - docker login $server -u $username  -p $password
       - docker pull $server/$username/$tag
-      - docker run --rm -d $server/$username/$tag
+      - docker run --rm -d $server/$username/$tag
+      - docker images
+      - docker rm -f $server/$username/$tag