Composer incompatibilities

- Git version from wheezy imcompatible with composer
- Needed zip for inspect headers.
Add various setup steps.

- Add ssh keys to authenticate with github
- Move config.json to uncommitted files so network config is not
  reveled.
- Add ssh to gitignore.
- Add setup section to readme
Merge pull request #3 from tommymcguiver/master

Docker container setup