changing version to 3.1 from 3.0.2

Signed-off-by: Mattias Andrée <maandree@operamail.com>
info: +q, ++q, -Q and --Q

Signed-off-by: Mattias Andrée <maandree@operamail.com>
update change log

Signed-off-by: Mattias Andrée <maandree@operamail.com>
add +q and -Q to opt parsing

Signed-off-by: Mattias Andrée <maandree@operamail.com>