Remove vendored cuberite

We can download the latest version in the Dockerfile

Signed-off-by: Dave Tucker <dt@docker.com>

Author: Dave Tucker

Dockerfile

@@ -9,11 +9,12 @@ COPY ./go /go
 RUN cd /go/src/goproxy; go install
 RUN cd /go/src/gosetup; go install
 
-# Copy Cuberite server (Minecraft C++ server)
-# with special empty world for Dockercraft
-COPY ./cuberite_server /srv/cuberite_server
-COPY ./world /srv/world
-COPY ./docs/img/logo64x64.png /srv/logo.png
+# Download Cuberite server (Minecraft C++ server)
+# and load up a special empty world for Dockercraft
+WORKDIR /srv
+RUN sh -c "$(wget -qO - https://raw.githubusercontent.com/cuberite/cuberite/master/easyinstall.sh)" && mv Server cuberite_server
+COPY ./world world
+COPY ./docs/img/logo64x64.png logo.png
 
-COPY ./start.sh /srv/start.sh
+COPY ./start.sh start.sh
 CMD ["/bin/bash","/srv/start.sh"]