website: update required options for DO

CHANGELOG.md

@@ -5,6 +5,7 @@ BACKWARDS INCOMPATIBILITIES:
   * The DigitalOcean builder no longer supports the v1 API which has been
       deprecated for some time. Most configurations should continue to
       work as long as you use the `api_token` field for auth.
+  * builder/digitalocean: `image`, `region`, and `size` are now required.
 
 FEATURES:
 

website/source/docs/builders/digitalocean.html.markdown

@@ -29,28 +29,25 @@ each category, the available configuration keys are alphabetized.
 * `api_token` (string) - The client TOKEN to use to access your account.
   It can also be specified via environment variable `DIGITALOCEAN_API_TOKEN`, if set.
 
-### Optional:
-
-* `droplet_name` (string) - The name assigned to the droplet. DigitalOcean
-  sets the hostname of the machine to this value.
-
 * `image` (string) - The name (or slug) of the base image to use. This is the
-  image that will be used to launch a new droplet and provision it. This
-  defaults to 'ubuntu-12-04-x64' which is the slug for "Ubuntu 12.04.4 x64".
+  image that will be used to launch a new droplet and provision it.
   See https://developers.digitalocean.com/documentation/v2/#list-all-images for details on how to get a list of the the accepted image names/slugs.
 
-* `private_networking` (boolean) - Set to `true` to enable private networking
-  for the droplet being created. This defaults to `false`, or not enabled.
-
 * `region` (string) - The name (or slug) of the region to launch the droplet in.
   Consequently, this is the region where the snapshot will be available.
-  This defaults to "nyc3", which is the slug for "New York 3".
   See https://developers.digitalocean.com/documentation/v2/#list-all-regions for the accepted region names/slugs.
 
 * `size` (string) - The name (or slug) of the droplet size to use.
-  This defaults to "512mb", which is the slug for "512MB".
   See https://developers.digitalocean.com/documentation/v2/#list-all-sizes for the accepted size names/slugs.
 
+### Optional:
+
+* `droplet_name` (string) - The name assigned to the droplet. DigitalOcean
+  sets the hostname of the machine to this value.
+
+* `private_networking` (boolean) - Set to `true` to enable private networking
+  for the droplet being created. This defaults to `false`, or not enabled.
+
 * `snapshot_name` (string) - The name of the resulting snapshot that will
   appear in your account. This must be unique.
   To help make this unique, use a function like `timestamp` (see
@@ -78,6 +75,9 @@ own access tokens:
 ```javascript
 {
   "type": "digitalocean",
-  "api_token": "YOUR API KEY"
+  "api_token": "YOUR API KEY",
+  "image": "ubuntu-12-04-x64",
+  "region": "nyc2",
+  "size": "512mb"
 }
 ```