Prevent encoding problems while reassembling packets

Thanks to @montymintypie

Fixes koraktor/steam-condenser#192
Improve detection of RCON bans

Thanks to @CEikermann

Fixes koraktor/steam-condenser#190
Do not override getMessage() in WebApiException

Thanks to @Yeggstry

Fixes koraktor/steam-condenser#193
Version bump to 1.3.2
Merge branch '1.3-stable'