Dropped the email parameter, not needed anymore

Author: TrafeX

.travis.yml

@@ -9,7 +9,7 @@ env:
 script:
   - docker --version
   - export TAG=`if [ "$TRAVIS_BRANCH" == "master" ]; then echo "latest"; else echo $TRAVIS_BRANCH ; fi`
-  - docker login -e $DOCKER_EMAIL -u $DOCKER_USER -p $DOCKER_PASS
+  - docker login -u $DOCKER_USER -p $DOCKER_PASS
   - docker build -t $REPO:$COMMIT .
   - docker tag $REPO:$COMMIT $REPO:$TAG
   - docker push $REPO