Updates to allow for multiple calls to the modules

basicly, this works now

```hcl

module "ecs-cluster" {
  source       = "./terraform-ecs-cluster"
  name         = "infra-services"
  servers      = 1
  subnet_id    = "subnet-6e101446"
  vpc_id       = "vpc-99e73dfc"
}

module "ecs-cluster2" {
  source       = "./terraform-ecs-cluster"
  name         = "infra-services2"
  servers      = 1
  subnet_id    = "subnet-6e101446"
  vpc_id       = "vpc-99e73dfc"
}
```

iam.tf

@@ -1,10 +1,10 @@
 resource "aws_iam_instance_profile" "ecs_profile" {
-    name = "ecs_test_profile"
+    name = "tf-created-AmazonECSContainerProfile-${var.name}"
     roles = ["${aws_iam_role.ecs-role.name}"]
 }
 
 resource "aws_iam_role" "ecs-role" {
-    name               = "tf-created-AmazonECSContainerInstanceRole"
+    name               = "tf-created-AmazonECSContainerInstanceRole-${var.name}"
 
     assume_role_policy = <<EOF
 {
@@ -25,7 +25,7 @@ EOF
 }
 
 resource "aws_iam_policy" "ecs-policy" {
-    name        = "tf-created-AmazonECSContainerInstancePolicy"
+    name        = "tf-created-AmazonECSContainerInstancePolicy-${var.name}"
     description = "A terraform created policy for ECS"
     policy      = <<EOF
 {

main.tf

@@ -19,12 +19,12 @@ EOF
 
     #Instance tags
     tags {
-        Name = "${var.cluster_name} ${var.tagName}-${count.index}"
+        Name = "${var.name} ${var.tagName}-${count.index}"
     }
 }
 
 resource "aws_security_group" "ecs" {
-  name        = "ecs-sg"
+  name        = "ecs-sg-${var.name}"
   description = "Container Instance Allowed Ports"
   vpc_id      = "${var.vpc_id}"
   ingress {
@@ -48,5 +48,5 @@ resource "aws_security_group" "ecs" {
 
 # Make this a var that an get passed in?
 resource "aws_ecs_cluster" "cluster" {
-  name = "${var.cluster_name}"
+  name = "${var.name}"
 }

variables.tf

@@ -11,7 +11,7 @@ variable "ami" {
     }
 }
 
-variable "cluster_name" {
+variable "name" {
   description = "AWS ECS Cluster Name"
 }
 variable "key_name" {