Basic class methods for Dogestry.
Fix tests for rspec 3.0
Check if dogestry command line exist and add logging.
Modify pull_image task to be able to pull from S3.
Raise error when failed to pull/push from/to S3. Also, when rake task failed to pull from S3, fallback to the slower pull from docker server.
renamed aws_access_key to aws_access_key_id
Support hostnames with multiple components
Add Accept header to rolling_deploy check
Separate dogestry stuff in different namespace.
Change default docker daemon port to 2375. User can still use old docker server port by setting it explicitly using host DSL.
Moved threaded echo() method to Centurion::Logging so Centurion::Dogestry can use it.
Merge pull request #49 from skarap/custom_reg_improvements

Support hostnames with multiple components in custom repository addresses
Flesh out more tests around registry URL handling.
Update README to show example on how to use Dogestry.
Merge pull request #47 from didip/dogestry

Dogestry
Added more detailed explanation of using Dogestry.
Fix list syntax.
Add leader about Dogestry integration.
fix host replacement in readme
Update registry options for clarity.