define maven properties for docker envs
define maven properties with default values for docker environment variables.
this enables users to override for ex. JAVA_OPTS of tomcat or the tomcat port.
furthermore these can be used in setting up acceptance tests since they are
available in maven.
* add maven properties for docker envs
* fix docker image name of the image created in this repo
* update docker image for teleivo/openmrs-platform:2.0.0-1 which replaced
deprecated MySQL session variable "storage_engine"
* update docker.md
