Update dependencies (#163)

* update dependencies

* fix kubeconfig loader

* use pipenv

* add missing pipenv shell

* tox-pipenv

* pipenv on Travis

* add cache files to gitignore

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.6
+FROM alpine:3.7
 MAINTAINER Henning Jacobs <henning@jacobs1.de>
 
 EXPOSE 8080
@@ -6,19 +6,21 @@ EXPOSE 8080
 RUN apk add --no-cache python3 python3-dev gcc musl-dev zlib-dev libffi-dev openssl-dev ca-certificates && \
     python3 -m ensurepip && \
     rm -r /usr/lib/python*/ensurepip && \
-    pip3 install --upgrade pip setuptools gevent && \
+    pip3 install --upgrade pipenv gevent && \
     apk del python3-dev gcc musl-dev zlib-dev libffi-dev openssl-dev && \
     rm -rf /var/cache/apk/* /root/.cache /tmp/* 
 
 COPY scm-source.json /
 
-COPY requirements.txt /
-RUN pip3 install -r /requirements.txt
+COPY Pipfile /
+COPY Pipfile.lock /
+
+WORKDIR /
+RUN pipenv install --system --deploy --ignore-pipfile
 
 COPY kube_ops_view /kube_ops_view
 
 ARG VERSION=dev
 RUN sed -i "s/__version__ = .*/__version__ = '${VERSION}'/" /kube_ops_view/__init__.py
 
-WORKDIR /
 ENTRYPOINT ["/usr/bin/python3", "-m", "kube_ops_view"]