must be run as the same user

environment variables are not passed if you run a process as
another user. We will have to explore different ways of running
processes under other users while still having access to all
of the other user's environment variables.
add $REGISTRY_PORT

requirement of ./run.sh
preserve the environment variables
move REGISTRY_PORT with other exports
Merge pull request #4 from deis/fix-registry-envvars

Fix registry envvars