complete my docker dev image

docker/img/Dockerfile → docker/dev/Dockerfile

@@ -16,3 +16,8 @@ RUN cd /root/gopath/src/github.com/opencontainers/runc && \
 RUN go get github.com/genuinetools/img
 RUN cd /root/gopath/src/github.com/genuinetools/img/ && make build && make install && install -D -m0755 img /usr/local/sbin/img
 
+RUN apk --update --no-cache add \
+bash bash-completion \
+git-bash-completion \
+curl wget ncdu htop nmap nano \
+pcre-dev libpcre32