update packages to latest version

node_modules/npm/lib/prefix.js

@@ -0,0 +1,11 @@
+module.exports = prefix
+
+var npm = require("./npm.js")
+
+prefix.usage = "npm prefix\nnpm prefix -g\n(just prints the prefix folder)"
+
+function prefix (args, silent, cb) {
+  if (typeof cb !== "function") cb = silent, silent = false
+  if (!silent) console.log(npm.prefix)
+  process.nextTick(cb.bind(this, null, npm.prefix))
+}