Rubocop fixes

Author: meanphil

test/fixtures/product.rb

@@ -4,7 +4,7 @@ class Product < ActiveResource::Base
   self.site = "http://37s.sunrise.i:3000"
   # X-Inherited-Header is for testing that any subclasses
   # include the headers of this class
-  self.headers["X-Inherited-Header"] = 'present'
+  self.headers["X-Inherited-Header"] = "present"
 end
 
 class SubProduct < Product