Environment:
Windows7, Wamp, WP-CLI, 1.5

Summary:
Cannot create post with latin characters in post title

Command to reproduce the bug:
wp post create --post_type=page --post_status=publish --post_title="Perícias Contábeis"
or
wp post create --post_type=page --post_status=publish --post_title="Atuação"

Actual Results:
Error: Não foi possível inserir o post no banco de dados

If I remove the characters "í", "á", "ç" and "ã" (Portuguese), the post is saved.
wp post create --post_type=page --post_status=publish --post_title="Pericias Contabeis"
Result:
Success: Created post 56