Reasoning: Even if I set some NODE_PATH in the environment, if I download a node program that has bundled its dependencies, then that program should work as the developer intended, or else we've got weird errors.
Also, this will help gently nudge users towards favoring the cleaner future over the dirty past.
Okay for landing in v0.4. Please modify docs, though.
Closed by 3599c71 node_modules folders should be highest priority
Closes GH-690 node_modules folders should be highest priority