Revert "add support for loading from relative directories to make the example load out of the box"

This reverts commit 3a9623cdd7f1f7a376442d36ee760de1f9ff1b08.

spine-corona/spine-corona/spine.lua

@@ -25,9 +25,6 @@
 
 spine = {}
 
-local path = system.pathForFile("../")
-package.path = package.path .. ";".. path .. "/?.lua"
-
 spine.utils = require "spine-lua.utils"
 spine.SkeletonJson = require "spine-lua.SkeletonJson"
 spine.SkeletonData = require "spine-lua.SkeletonData"