filter.
- Added better support for \0 characters.
- Added utility function to HTML encode low/high characters.
- Added support for encode low/high flags to the string and special_chars
filter.
- Added support for strip and encoding flags to the unsafe_raw filter.
- Added comments to filter stubs as per discussion with Ilia
- Renamed regexp to validate_regexp filter
- Added stubs for validate_url, validate_email and validate_ip filters.
- Implemented "string" (stripped) filter