fixed database realted issues

Added

• permission to overwrite maxwarps per player (ultimateteams.max_warps.<number>)
• option to stack fixed warp limit with permissions limit
  (so a limit of 2 in the config, and a player permission limit of 3 equals 5 warps for that player)
• option not to log the wipe invites task
• fixed on the databases handler
• fixed bstats not working correctly

You need to regenerate your config for this version

- Added a dedicated check for spaces in teams name, closing #23
- fixed %TEAMPREFIX% placeholder not showing the new team prefix when using /team prefix command