updating to build command in script

doesn't have webpack version issue

fixes #20

Dockerfile

@@ -16,8 +16,6 @@ RUN apt-get update && apt-get install -y \
     curl -sL https://deb.nodesource.com/setup_7.x | sudo -E bash - && \
     apt-get install -y nodejs
 
-RUN npm install webpack -g
-
 
 RUN pip install -U https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.12.1-cp27-none-linux_x86_64.whl
 
@@ -27,7 +25,7 @@ RUN pip install -r /tmp/requirements.txt
 COPY . /src/
 
 WORKDIR /src/static/
-RUN npm install && webpack -p
+RUN npm install && npm run build
 
 WORKDIR /src/server/