Detect CoffeeScript with generated comment

lib/linguist/blob_helper.rb

@@ -280,6 +280,11 @@ module Linguist
     def generated_coffeescript?
       return unless extname == '.js'
 
+      # CoffeeScript generated by > 1.2 include a comment on the first line
+      if lines[0] =~ /^\/\/ Generated by /
+        return true
+      end
+
       if lines[0] == '(function() {' &&     # First line is module closure opening
           lines[-2] == '}).call(this);' &&  # Second to last line closes module closure
           lines[-1] == ''                   # Last line is blank