small dockerfile tweaks

Dockerfile

@@ -1,13 +1,15 @@
-FROM node:6
+FROM node:7
+# FROM ubuntu:16.04
+
+RUN echo 'deb http://ftp.debian.org/debian jessie-backports main' >> /etc/apt/sources.list
 
 RUN mkdir -p /usr/src/app
 WORKDIR /usr/src/app
 COPY package.json /usr/src/app/
-RUN npm install --production
-RUN apt-get install git nodejs npm \
-libcairo2-dev libjpeg8-dev libpango1.0-dev libgif-dev libpng-dev build-essential g++ \
-ffmpeg \
+RUN apt-get update --yes && apt-get upgrade --yes
+RUN apt-get install nodejs npm libcairo2-dev libjpeg62-turbo-dev libpango1.0-dev libgif-dev libpng-dev build-essential g++ ffmpeg
 COPY ./ /usr/src/app/
+RUN npm install --production
 
 EXPOSE 8888
 CMD [ "npm", "start" ]