nodePackages: split into v4/v6 package set

A full package set is not needed for both node versions. The goal is to
remove the large amount of generated files. Instead only packages which
might be needed in v4 development environments are added to a dedicated
node-packages-v4.json file.

pkgs/development/node-packages/generate.sh

@@ -1,5 +1,6 @@
-#!/bin/sh -e
+#!/usr/bin/env nix-shell
+#! nix-shell -i bash -p nodePackages.node2nix
 
 rm -f node-env.nix
-node2nix -i node-packages.json -o node-packages-v4.nix -c composition-v4.nix
-node2nix -6 -i node-packages.json -o node-packages-v6.nix -c composition-v6.nix
+node2nix -i node-packages-v4.json -o node-packages-v4.nix -c composition-v4.nix
+node2nix -6 -i node-packages-v6.json -o node-packages-v6.nix -c composition-v6.nix

pkgs/development/node-packages/node-packages-v4.json

@@ -0,0 +1,10 @@
+[
+  "coffee-script"
+, "grunt-cli"
+, "gulp"
+, "node-gyp"
+, "node-inspector"
+, "node-pre-gyp"
+, "npm"
+, "titanium"
+]

pkgs/development/node-packages/node-packages-v6.json

@@ -59,7 +59,6 @@
 , "stylus"
 , "svgo"
 , "tern"
-, "titanium"
 , "typescript"
 , "uglify-js"
 , "ungit"