Allow each instance to have a public IP assigned via LC. (#5)

* Removed some commented out code.

* Allow each instance to have a public IP assigned to it (off by default).

* Updated README

README.md

@@ -17,9 +17,9 @@ Module Input Variables
 - `region` - AWS Region - defaults to us-east-1
 - `servers`  - Number of ECS Servers to start in the cluster - defaults to 2
 - `instance_type` - AWS instance type - defaults to t2.micro
+- `associate_public_ip_address` - assign a publicly-routable IP address to every instance in the cluster - default: `false`.
 - `docker_storage_size` - EBS Volume size in Gib that the ECS Instance uses for Docker images and metadata - defaults to 22
 - `dockerhub_email` - Email Address used to authenticate to dockerhub. http://docs.aws.amazon.com/AmazonECS/latest/developerguide/private-auth.html
-
 - `dockerhub_token` - Auth Token used for dockerhub. http://docs.aws.amazon.com/AmazonECS/latest/developerguide/private-auth.html
 - `extra_tags` - Additional tags to be added to the ECS autoscaling group. Must be in the form of an array of hashes. See https://www.terraform.io/docs/providers/aws/r/autoscaling_group.html for examples.
 ```

main.tf

@@ -13,13 +13,13 @@ data "aws_ami" "ecs_ami" {
 }
 
 resource "aws_launch_configuration" "ecs" {
-  #name                 = "ecs-${var.name}"
   name_prefix          = "ecs-${var.name}-"
   image_id             = "${var.ami == "" ? format("%s", data.aws_ami.ecs_ami.id) : var.ami}" # Workaround until 0.9.6
   instance_type        = "${var.instance_type}"
   key_name             = "${var.key_name}"
   iam_instance_profile = "${aws_iam_instance_profile.ecs_profile.name}"
   security_groups      = ["${aws_security_group.ecs.id}"]
+  associate_public_ip_address = "${var.associate_public_ip_address}"
   ebs_block_device {
     device_name = "/dev/xvdcz"
     volume_size = "${var.docker_storage_size}"
@@ -40,7 +40,6 @@ EOF
 }
 
 resource "aws_autoscaling_group" "ecs" {
-  #name                 = "ecs-asg-${var.name}"
   name                 = "asg-${aws_launch_configuration.ecs.name}"
   vpc_zone_identifier  = ["${var.subnet_id}"]
   launch_configuration = "${aws_launch_configuration.ecs.name}"

variables.tf

@@ -79,3 +79,7 @@ variable "tagName" {
 variable "vpc_id" {
   description = "The AWS VPC ID which you want to deploy your instances"
 }
+
+variable "associate_public_ip_address" {
+  default = false
+}