[Review] Request from 'greygoo' @ 'SUSE/pennyworth/review_141028_make_ssh_key_deployment_configurable_'

Please review the following changes:
  * 820c483 Make ssh key setup optional for cases of test booting an image that already has an ssh key deployed.
  * e9fa775 Update README.md
  * 7cfaf92 Merge pull request #18 from SUSE/review_141015_enable_hound
  * a05c42a Enable Hound checking for our pull requests
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