Tokens [Multi-plugin Support] [MySQL Support]

• Cleaned up a lot of code
• Added ShopGUI+ support
• Documented new methods and usages
• Added RedeemModules to make plugin updates easier and much quicker
• Added Auto-Update checks
• Unified some old, dirty code
• Added more error catches to prevent large error messages printing to console

  I've finished migrating Tokens over to Gradle for faster, more reliable builds.

  I've also fixed exploits that I won't explain until more people have updated their plugin version...