Simple Stack: Stack any items to 64

Lot's of stuff happening in this release!

Commands
/simplestack help - An in game help menu for admin commands
/simplestack reload - Reload the blacklist/whitelist from config

Permissions
simplestack.use - Use Simple Stack to combine items in inventories
simplestack.help - Allow access to view the admin help menu (/simplestack help)
simplestack.reload - Allow access to reload the config (/simplestack reload)

Config
In config.yml there are options for configuring which items should be stacked by this plugin or not. A list mode can be choosed (blacklist / whitelist) which tells the plugin how to handle items in the list.