Updating the App Service example to be complete

This removes support for Publishing, since the SCM URL's aren't consistent across Sovereign Clouds (China/Germany/Govt etc)
Switches to using the new `default_site_hostname` field introduced in hashicorp#612 rather than assuming what it is

examples/app-service/README.md

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+# Azure App Service Sample
+
+Sample to deploy an App Service within an App Service Plan.
+
+## Creates
+
+1. A Resource Group
+2. An [App Service Plan](https://docs.microsoft.com/en-us/azure/app-service/azure-web-sites-web-hosting-plans-in-depth-overview)
+3. An [App Service](https://azure.microsoft.com/en-gb/services/app-service/) configured for usage with .NET 4.x Application
+
+## Usage
+
+- Provide values to all variables (credentials and names).
+- Create with `terraform apply`
+- Destroy all with `terraform destroy --force`

examples/app-service/app.tf

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+# Configure the Microsoft Azure Provider
+provider "azurerm" {
+  # if you're using a Service Principal (shared account) then either set the environment variables, or fill these in:  # subscription_id = "..."  # client_id       = "..."  # client_secret   = "..."  # tenant_id       = "..."
+}
+
+resource "azurerm_resource_group" "default" {
+  name     = "${var.resource_group_name}"
+  location = "${var.location}"
+}
+
+resource "azurerm_app_service_plan" "default" {
+  name                = "${var.app_service_name}-plan"
+  location            = "${azurerm_resource_group.default.location}"
+  resource_group_name = "${azurerm_resource_group.default.name}"
+
+  sku {
+    tier = "${var.app_service_plan_sku_tier}"
+    size = "${var.app_service_plan_sku_size}"
+  }
+}
+
+resource "azurerm_app_service" "default" {
+  name                = "${var.app_service_name}"
+  location            = "${azurerm_resource_group.default.location}"
+  resource_group_name = "${azurerm_resource_group.default.name}"
+  app_service_plan_id = "${azurerm_app_service_plan.default.id}"
+
+  site_config {
+    dotnet_framework_version = "v4.0"
+    remote_debugging_enabled = true
+    remote_debugging_version = "VS2015"
+  }
+
+  # app_settings {
+  #   "SOME_KEY" = "some-value"
+  # }
+  # connection_string {
+  #   name  = "Database"
+  #   type  = "SQLServer"
+  #   value = "Server=some-server.mydomain.com;Integrated Security=SSPI"
+  # }
+}
+
+output "app_service_name" {
+  value = "${azurerm_app_service.default.name}"
+}
+
+output "app_service_default_hostname" {
+  value = "https://${azurerm_app_service.default.default_site_hostname}"
+}

examples/app-service/variables.tf

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+variable "resource_group_name" {
+  type = "string"
+}
+
+variable "location" {
+  type = "string"
+}
+
+variable "app_service_name" {
+  type = "string"
+}
+
+variable "app_service_plan_sku_tier" {
+  type    = "string"
+  default = "Basic"  # Basic | Standard | ...
+}
+
+variable "app_service_plan_sku_size" {
+  type    = "string"
+  default = "B1"     # B1 | S1 | ...
+}