Google Cloud Storage support

We introduce a new node_type, storage, which can support different file
storage backends and makes them available for browsing via dedicated
entry points in the application. We intend to keep pillar storage
agnostic and support both internal/local storages as well as
remote/hosted solutions.

docker/Dockerfile

@@ -9,6 +9,9 @@ git \
 nano \
 zlib1g-dev \
 libjpeg-dev \
+python-crypto \
+python-openssl \
+libssl-dev \
 software-properties-common
 
 RUN add-apt-repository ppa:mc3man/trusty-media \