feat(graphs): add getEmbeds function

Signed-off-by: Josh Kurz <josh.kurz@turner.com>

lib/api/graph.js

@@ -125,6 +125,20 @@ function revokeEmbed(embedId, callback){
     client.request("GET", "/graph/embed/" + embedId + "/revoke", callback);
 }
 
+
+/*section: graph
+ *comment: get all embeds from datadog
+ *example: |
+ *  ```javascript
+ *  dogapi.graph.getEmbeds(function(err, res){
+ *    console.dir(res);
+ *  });
+ *  ```
+ */
+function getEmbeds(callback) {
+    client.request("GET", '/graph/embed', callback);
+}
+
 module.exports = {
     snapshot: snapshot,
     createEmbed: createEmbed,