Merge pull request #398 from thedamian/master

NODE was using the wrong download (now using the .xz version for faster download)

packages/node.rb

@@ -2,7 +2,7 @@ require 'package'
 
 class Node < Package
   version '6.9.4'
-  source_url 'https://nodejs.org/dist/v6.9.4/node-v6.9.4.tar.gz'
+  source_url 'https://nodejs.org/dist/v6.9.4/node-v6.9.4.tar.xz'
   source_sha1 '3b798acf7af4cd3f0efdb86bea009794492129ba'
 
   depends_on 'buildessential'

packages/node_current.rb

@@ -2,7 +2,7 @@ require 'package'
 
 class Node_current < Package
   version '7.4.0'
-  source_url 'https://nodejs.org/dist/v7.4.0/node-v7.4.0.tar.gz'
+  source_url 'https://nodejs.org/dist/v7.4.0/node-v7.4.0.tar.xz'
   source_sha1 'e31d4d67a6f39ccce2db66dcfa0e6c11851c1375'
 
   depends_on 'buildessential'