Refined files copied into docker container.

Dockerfile

 FROM python:3.3-slim
 MAINTAINER Allan Tribe <atribe13@gmail.com>
 
-ADD . /src
+VOLUME /src/
+COPY InfluxdbSpeedtest.py requirements.txt /src/
 WORKDIR /src
 
 RUN pip install -r requirements.txt
 
-CMD ["python", "/src/InfluxdbSpeedtest.py"]
+CMD ["python", "-u", "/src/InfluxdbSpeedtest.py"]