core: overlong UTF-8 encoding and surrogates (U+D800-DFFF) are invalid.
Merge branch 'master' of git://github.com/anders/weechat into anders-master
core: fix code style in function utf8_is_valid()
tests: add UTF-8 tests (check of some invalid UTF-8 chars)
core: update ChangeLog
core: add contributor in AUTHORS.asciidoc