Unable to install packetpig from posted installation steps

[mayank1807]

I am using Ubuntu 14.04 LTS with proxy server authentiction and installed docker and docker.io and when I run command "docker build packetpig ." from the folder where DockerFile is placed then I am getting following in terminal -

mayank@mayank-pc:~/Downloads/packetpig-master$ docker build packetpig .
Usage: docker build [OPTIONS] PATH | URL | -
Build a new image from the source code at PATH
--force-rm=false Always remove intermediate containers, even after unsuccessful builds
--no-cache=false Do not use cache when building the image
-q, --quiet=false Suppress the verbose output generated by the containers
--rm=true Remove intermediate containers after a successful build
-t, --tag="" Repository name (and optionally a tag) to be applied to the resulting image in case of success

Please help me how to install PacketPig.