Add the ability to send several commands in a row with one request

[Pavel Korotkiy]

Something like that:

./rcon -a 1127.0.01:16260 -p password -c "banuser one" "banuser two" "banuser three"
User one is now banned
---------
User two is now banned
---------
User three is now banned

[Pavel Korotkiy]

v0.9.0

./rcon -a 127.0.0.1:16260 -p password command1 command2 command3