remove is_error_packet() method
Merge branch 'master' of github.com:nakagami/CyMySQL
Merge branch 'master' of github.com:nakagami/CyMySQL
Merge branch 'master' of github.com:nakagami/CyMySQL
Merge branch 'master' of github.com:nakagami/CyMySQL
Merge branch 'master' of github.com:nakagami/CyMySQL
Merge branch 'master' of github.com:nakagami/CyMySQL
Merge branch 'master' of github.com:nakagami/CyMySQL
Merge branch 'master' of github.com:nakagami/CyMySQL