This adds support for building and pushing docker containers
when you perform either `kompose convert` or `kompose up`.
Docker Compose files who have build parameters with their respective
image and build keys will automatically be both built and pushed.
Resolves#576
This PR includes `output-os-template.json` in `nginx-node-redis` example,
which is basically output template contains `%URI%` and `%REF%` variables
which will be filled while initializing test cases and new will be stored as
`/tmp/output-os.json`
This will remove the problem of git uri and ref.
