[20160910125708] Build Import and Export

The Rack API now supports exporting and importing builds. You can use this functionality to move builds between different Racks and to ensure that you are using identical images throughout your CI/CD pipeline.

$ convox builds export B12345678 --app myapp --rack staging > export.tgz

$ convox builds import --app myapp --rack production < export.tgz

Enhancements

Fixes