ESAPI HTTP Protection

Feature Overview
This request wrapper simply overrides unsafe methods in the HttpServletRequest API with safe versions that return canonicalized data where possible. The wrapper returns a safe value when a validation error is detected, including stripped or empty strings.

The SafeRequest class implements HttpServletRequest and seamlessly adds HTTP protection.

Possible Enhancements

 * Jeff created this so perfectly that it does not necessitate additional enhancements.