NEW FEATURES:
- new 'fulldump' option to ignore max string/array/hash.
- also stringify on to_string()
- ContentType filter shows utf8 symbol for image/audio/video/etc
- ContentType filter now has its own color
- ContentType filter understands Sereal binaries
BUG FIXES:
- prevent 'undefined' warning in ContentType filter
- fix test on old HTTP::Headers
OTHER:
- improved documentation