Require - A simple library downloader

Introduction:
    If you want to use this class you need to put this at the beginning of you script.
    Example:
        -------------------------------------
        if player.charName ~= "Brand" then return end
        require "SourceLib"

        local libDownloader = Require("Brand script")
        libDownloader:Add("VPrediction", "https://bitbucket.org/honda7/bol/raw/master/Common/VPrediction.lua")
        libDownloader:Add("SOW",         "https://bitbucket.org/honda7/bol/raw/master/Common/SOW.lua")
        libDownloader:Check()

        if libDownloader.downloadNeeded then return end
        -------------------------------------

Functions:
    Require(myName)

Members:
    Require.downloadNeeded

Methods:
    Require:Add(name, url)
    Require:Check()