remove slurp_utf8 and spew_utf8
Revert "remove slurp_utf8 and spew_utf8"

This reverts commit 3d58833493409f0a217042ae9a6209289f186554.
remove slurp_utf8 and spew_utf8
Merge pull request #148 from duckduckgo/zaahir/utf8-fix

remove slurp_utf8 and spew_utf8
whoops, remove dev warn