Fixed ban plugin error

- If a ban does not have an unban time, then it will assume it is
permanent.
Timeleft notification says what the next map is

Also fixed a bug where a vote ending right as a round ended would cause
it to say the map was switching but not actually switch.
Merge pull request #14 from Person8880/develop

Fixed a bug with bans, a bug with map votes and made the time left notification say what the next map is when switching.