Overview

Add terraform resources for chatta.geotrellis.io. This PR makes the following additions:

Use the terraform-aws-ecs-web-service to define a service for the gt-chatta container.
Add a CloudFront distribution with the ECS service as an origin.
Access core infrastructure remote state information with the terraform_remote_state data source
Add firewall rules to allow communication between the Chatta webservice ALB and the Container Instance, and allow HTTP(S) ingress to the ALB from the public internet.
Travis CI config

Testing