Create a class method that returns a proc needed for parameter filtering

@ggrossman @rtatsumi @grosser @steved555 @morten @craiglittle 

Ok so I'm thinking of doing something like this.

```
class CreditCardSanitizer
  def self.parameter_filter
    Proc.new { |_, value| new.sanitize!(value) }
  end
end
```

with https://github.com/zendesk/zendesk_core_application/compare/master...vkmita/API-181?expand=1

### References
https://zendesk.atlassian.net/browse/API-181