Proposal: Initial images proposal

This is a proposal to add a higher level image component that can keep track of Docker image repositories, images, and image metadata.
It's more about being able to mint many pods or many pod templates from a known upstream source.  I.e. - how do you get an initial pod template and populate those environment variables?  You need to look at the image, know what they are, etc.

So think of an image as docker metadata + data that can be used to create pod templates.  Also, you don't always want to leave it up to the image author - i.e. you created a Redis image, but set the default memory to 512MB, but exposed an env var.  I might want to set the default memory via an env var on every pod template that my automated builds create.