v0.4.0

• ENHANCEMENT: Terragrunt now supports an include block and several helpers that you can use in the .terragrunt file to reuse settings from another .terragrunt file. This significantly reduces the amount of copy/paste and manual maintenance you have to do if you are maintaining multiple Terraform folders (and thereby, multiple .terragrunt files). For usage instructions, see: https://github.com/gruntwork-io/terragrunt/tree/inherit#managing-multiple-terragrunt-files