First crack at something resembling a fix for #74

lib/bundle.js

@@ -0,0 +1,22 @@
+
+module.exports = bundle
+
+var npm = require("../npm")
+  , fs = require("fs")
+  , path = require("path")
+  , log = require("./utils/log")
+function bundle (args, cb) {
+  log(args, "bundle")
+  var location = args.pop()
+    , usage = "Usage: npm bundle [<pkg> [<pkg> ...]] <location>"
+  if (!location) return cb(new Error(usage))
+  if (location.charAt(0) !== "/") {
+    location = path.join(process.cwd(), location)
+  }
+  fs.stat(location, function (er, s) {
+    if (er || !s.isDirectory()) return cb(new Error(usage))
+    npm.config.set("root", location)
+    npm.config.set("binroot", null)
+    npm.commands.install(args, cb)
+  })
+}

npm.js

@@ -46,6 +46,7 @@ var commandCache = {}
   , "view"
   , "repl"
   , "rebuild"
+  , "bundle"
   ].forEach(function (c) {
     Object.defineProperty(npm.commands, c, { get : function () {
       c = c === "list" ? "ls"