Improved random of functions.
Added command "/lb" which refers to "/luckyblock".
Changed function that drop the items (thank @dxm_hippie).
Added the possibility to change the block of luckyblock
Added permission node:
-"luckyblock.command"=Permission to use the command /luckyblock or /lb (Default: OP)
-"luckyblock.use"= Permission to use the plugin to players(Default: All)
-Chest = adds the elements...