Add resource_logging_billing_account_sink resource (hashicorp#457)

* Add resource_logging_billing_account_sink resource

* Fix bad style

docs/r/logging_billing_account_sink.html.markdown

@@ -0,0 +1,69 @@
+---
+layout: "google"
+page_title: "Google: google_logging_billing-account_sink"
+sidebar_current: "docs-google-logging-billing-account-sink"
+description: |-
+  Manages a billing account logging sink.
+---
+
+# google\_logging\_billing\_account\_sink
+
+Manages a billing account logging sink. For more information see
+[the official documentation](https://cloud.google.com/logging/docs/) and
+[Exporting Logs in the API](https://cloud.google.com/logging/docs/api/tasks/exporting-logs).
+
+Note that you must have the "Logs Configuration Writer" IAM role (`roles/logging.configWriter`)
+granted to the credentials used with terraform.
+
+## Example Usage
+
+```hcl
+resource "google_logging_billing_account_sink" "my-sink" {
+    name = "my-sink"
+    billing_account = "ABCDEF-012345-GHIJKL"
+
+    # Can export to pubsub, cloud storage, or bigtable
+    destination = "storage.googleapis.com/${google_storage_bucket.log-bucket.name}"
+}
+
+resource "google_storage_bucket" "log-bucket" {
+    name     = "billing-logging-bucket"
+}
+
+resource "google_project_iam_binding" "log-writer" {
+    role = "roles/storage.objectCreator"
+
+    members = [
+        "${google_logging_billing_account_sink.my-sink.writer_identity}",
+    ]
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `name` - (Required) The name of the logging sink.
+
+* `billing_account` - (Required) The billing account exported to the sink.
+
+* `destination` - (Required) The destination of the sink (or, in other words, where logs are written to). Can be a
+    Cloud Storage bucket, a PubSub topic, or a BigQuery dataset. Examples:
+```
+"storage.googleapis.com/[GCS_BUCKET]"
+"bigquery.googleapis.com/projects/[PROJECT_ID]/datasets/[DATASET]"
+"pubsub.googleapis.com/projects/[PROJECT_ID]/topics/[TOPIC_ID]"
+```
+    The writer associated with the sink must have access to write to the above resource.
+
+* `filter` - (Optional) The filter to apply when exporting logs. Only log entries that match the filter are exported.
+    See (Advanced Log Filters)[https://cloud.google.com/logging/docs/view/advanced_filters] for information on how to
+    write a filter.
+
+## Attributes Reference
+
+In addition to the arguments listed above, the following computed attributes are
+exported:
+
+* `writer_identity` - The identity associated with this sink. This identity must be granted write access to the
+    configured `destination`.

docs/r/logging_project_sink.html.markdown

@@ -59,7 +59,7 @@ resource "google_compute_instance" "my-logged-instance" {
   }
 }
 
-# A bucket to storage logs in.
+# A bucket to store logs in
 resource "google_storage_bucket" "log-bucket" {
     name     = "my-unique-logging-bucket"
 }

google.erb

@@ -342,6 +342,10 @@
     <li<%= sidebar_current("docs-google-logging") %>>
     <a href="#">Google Stackdriver Logging Resources</a>
     <ul class="nav nav-visible">
+      <li<%= sidebar_current("docs-google-logging-billing-account-sink") %>>
+      <a href="/docs/providers/google/r/logging_billing_account_sink.html">google_logging_billing_account_sink</a>
+      </li>
+
       <li<%= sidebar_current("docs-google-logging-project-sink") %>>
       <a href="/docs/providers/google/r/logging_project_sink.html">google_logging_project_sink</a>
       </li>