Readme is not fully applicable to windows

Hi,

I found that docker-compose could not be properly installed on a windows machine, within a boot2docker.
I fixed it useing: http://stackoverflow.com/questions/29289785/how-to-install-docker-compose-on-windows

TL;DR: run the command: tce-load -wi python && curl https://bootstrap.pypa.io/get-pip.py | sudo python - && sudo pip install -U docker-compose before executing the docker compose commands.