Revert "Remove dependencies on npm and n"

This reverts commit 1eca47e.

Author: Ilya Radchenko

package.json

@@ -17,6 +17,8 @@
   "author": "Peter Braden",
   "license": "BSD-3-Clause",
   "dependencies": {
+    "npm": "^2.7.1",
+    "n": "^2.1.0",
     "md5": "^2.0.0",
     "async": "^1.0.0",
     "fs-extra": "^0.8.1"