added VCR Cassette to the 'generated' list so they get suppressed

samples/YAML/vcr_cassette.yml

@@ -0,0 +1,20 @@
+---
+http_interactions:
+- request:
+    method: get
+    uri: http://example.com/
+    body: ''
+    headers: {}
+  response:
+    status:
+      code: 200
+      message: OK
+    headers:
+      Content-Type:
+      - text/html;charset=utf-8
+      Content-Length:
+      - '26'
+    body: This is the response body
+    http_version: '1.1'
+  recorded_at: Tue, 01 Nov 2011 04:58:44 GMT
+recorded_with: VCR 2.0.0