AWS default region for Smile.

I would've set it in the config file, but that's generated. Let's go
with the environment variable for now.

Repositories/Smile/.envrc

@@ -2,6 +2,7 @@ source_up
 export AWS_CONFIG_FILE="$HOME/.smile/aws/config"
 export AWS_PROFILE=smile-dev-admin
 export AWS_DEFAULT_PROFILE="$AWS_PROFILE"
+export AWS_DEFAULT_REGION=us-east-1
 export GEM_HOME="$HOME/Repositories/Smile/.gem"
 export GIT_AUTHOR_EMAIL='nimrod@smile.io'
 export GIT_AUTHOR_NAME='Nimrod Adar'