podex: initial import

podex is a command line tool to generate a kubernetes container manifest placeholder from docker image metadata

Example usage:
```
$ docker pull google/nodejs-hello
$ podex -yaml google/nodejs-hello > google/nodejs-hello/pod.yaml
$ podex -json google/nodejs-hello > google/nodejs-hello/pod.json
```

The `podex/` subdirectory could also be used to host example pods for popular docker images.