Openmrs platform docker

This a docker image for kenya emr distribution It contains everything needed to run kenya emr. Enable users to get started without having to setup the distrution themselves It includes the runtime environment, modules, war file, and the required docker files. Rename the main.env.example to main.env and use docker run --env-file=main.env to override the env variables defined in the docker file refer to http://ryannickel.com/html/playing_with_docker_enviornment_variables.html