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

lib/linguist/generated.rb

@@ -62,7 +62,8 @@ module Linguist
         generated_protocol_buffer? ||
         generated_jni_header? ||
         composer_lock? ||
-        node_modules?
+        node_modules? ||
+        vcr_cassette?
     end
 
     # Internal: Is the blob an XCode project file?
@@ -235,5 +236,13 @@ module Linguist
     def composer_lock?
       !!name.match(/composer.lock/)
     end
+
+    # Is the blob a VCR Cassette file?
+    #
+    # Returns true or false
+    def vcr_cassette?
+      # VCR Cassettes have "recorded_with: VCR" in the second last line.
+      return lines[-2].include?("recorded_with: VCR")
+    end
   end
 end

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

test/test_blob.rb

@@ -211,6 +211,9 @@ class TestBlob < Test::Unit::TestCase
     assert !blob("CSS/bootstrap.css").generated?
     assert blob("CSS/bootstrap.min.css").generated?
 
+    # Generated VCR
+    assert blob("YAML/vcr_cassette.yml").generated?
+
     assert Linguist::Generated.generated?("node_modules/grunt/lib/grunt.js", nil)
   end