Trying to figure out the path to the images directory

jewel_thief.rb

require "jewel_thief/version"
require "rubygems"
require "rubygame"
require "jewel_thief/game"
require "jewel_thief/player"

module JewelThief
  Game.new
end

player.rb

require "rubygame"

module JewelThief
  class Player
    include Rubygame::Sprites::Sprite

    def initialize
      super()
      @image = Surface.load 'jewel_thief/images/player.png'
      @rect = @image.make_rect
    end

    def draw(on_surface)
      @image.blit on_surface, @rect
    end
  end
end