Merge pull request #87 from yuvipanda/master

Switch base image to alpine + fix typo causing CI to fail

Dockerfile

@@ -1,12 +1,5 @@
-FROM ubuntu:17.04
+FROM python:3.6.3-alpine3.6
 
-RUN apt-get update && \
-    apt-get install --yes --no-install-recommends \
-            python3 \
-            python3-pip \
-            python3-setuptools \
-            git && \
-    apt-get clean && apt-get purge
 
 RUN mkdir /tmp/src
 ADD . /tmp/src

travis/travis-script.bash

@@ -6,6 +6,6 @@ VERSION=$(git rev-parse --short HEAD)
 docker build -t jupyter/repo2docker:${VERSION} .
 
 if [[ "$TRAVIS_PULL_REQUEST" == "false" ]]; then
-    docker login -u ${DOCKER_USERNAME} -p "${DOCKER_PASSWORD}"
+    docker login -u ${DOCKER_LOGIN} -p "${DOCKER_PASSWORD}"
     docker push jupyter/rep2docker:${VERSION}
 fi