Update public repository with recent changes

This update includes the recent changes made to Slugforge:
* Support for packing repositories that do not have a Procfile
* A bug fix for `slugforge deploy name`
* Pass AWS_DEFAULT_REGION through to deployment commands
* Deploys are now a no-op when deploying a slug to a box where that slug is already symlinked to `current`

@Tapjoy/opsautomation