1.8 and 1.9 support
  Default banner and glass colors can be set
  Players can set their own banner and glass colors
  26 variables which can be set to something commonly used (Such as setting "z" to 1,000,000)
  Equation displayed in GUI
  users.yml is future proof and can be convered automatically to SQL once implemented
  Custom permission nodes
  Charge players for each calculation
  Automatically check for updates
  Calculator item can be crafted to open the calculator
  Calculator recipe can be cstomized in config
  Calculator item can be changed in config
  All messages and item names can be customized in the lang.yml

Note: All permissions nodes can be changed within the config
  GUICalculator.*   -- Gives access to all plugin features
  GUICalculator.command   -- Gives access to the calculator command
  GUICalculator.admin   -- Gives access to set the server options via the calculator GUI
  GUICalculator.options   -- Gives access to the player to set their personal settings via calculator GUI
  GUICalculator.update   -- Tell the player when there is an update for the plugin avaliable
  GUICalculator.itemOpen   -- Open the calculator using specified item in the config
  GUICalculator.itemCraft   -- Allow the player to craft the calculator item