Changes:

• Changeable damage for TNT and Fireball (in the config.yml)
• Added toggleable messages for failed purchase, upgrades, successful usage of specials (only for some specific), respawn status
  
• added max-level for spawner upgrades

Fixes:

• Leave shortcuts didn't work when the user had the admin permission.
• Warp Powder related fixes
  
• Fixed #392 (thanks to zlataovce)

Thanks to notfoundname for making two huge pull request for this update ( #393 and #394)