Moving version to a single place in version.py (#358)

* Moving version to a single place in version.py
* Requirements in setup.py + tox.ini

Dockerfile

@@ -1,12 +1,14 @@
 FROM python:2.7-alpine
 
 ENV PUPPETBOARD_PORT 80
-ENV PUPPETBOARD_SETTINGS docker_settings.py
-RUN mkdir -p /usr/src/app
-WORKDIR /usr/src/app
+EXPOSE 80
 
-COPY requirements-docker.txt /usr/src/app/
-RUN pip install --no-cache-dir -r requirements-docker.txt
-COPY . /usr/src/app
+ENV PUPPETBOARD_SETTINGS docker_settings.py
+RUN mkdir -p /puppetboard
+WORKDIR /puppetboard
+
+COPY . /puppetboard
+RUN python setup.py install docker
+RUN rm -rf /puppetboard
 
 CMD gunicorn -b 0.0.0.0:${PUPPETBOARD_PORT} --access-logfile=/dev/stdout puppetboard.app:app