record battle result

[inada-s]

This patch enables:

• Store battle result into database.
• Display current battle count.

Before applying this patch, we have to execute following sql:

CREATE TABLE IF NOT EXISTS battle_record (
        battle_code text,
        user_id     text,
        players     integer default 0,
        pos         integer default 0,
        side        integer default 0,
        round       integer default 0,
        win         integer default 0,
        lose        integer default 0,
        kill        integer default 0,
        death       integer default 0,
        frame       integer default 0,
        result      text default '',
        created     timestamp,
        updated     timestamp,
        system      integer default 0,
        PRIMARY KEY (battle_code, user_id)
);
CREATE INDEX BATTLE_RECORD_USER_ID ON battle_record(user_id);
CREATE INDEX BATTLE_RECORD_PLAYERS ON battle_record(players);
CREATE INDEX BATTLE_RECORD_CREATED ON battle_record(created);