download: add @GITHUB download facility

Define a new alias (@GITHUB) for downloading raw files from github repos.

Signed-off-by: Álvaro Fernández Rojas <[email protected]>

include/download.mk

@@ -1,5 +1,6 @@
 #
 # Copyright (C) 2006-2012 OpenWrt.org
+# Copyright (C) 2016 LEDE project
 #
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.

scripts/download.pl

@@ -1,6 +1,7 @@
 #!/usr/bin/env perl
 # 
 # Copyright (C) 2006 OpenWrt.org
+# Copyright (C) 2016 LEDE project
 #
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.