rm -rf npm submodule command

Noticed today that 'npm submodule' is broken in npm 2.0.

Went digging, and thought 'Hey, how did this EVER work?'

Dug a bit deeper, and found that this command was actually let go way back in the summer of 2013, and had been hanging around ever since due to a glitch in the system.

![fix-the-glitch](https://cloud.githubusercontent.com/assets/9287/4483370/dcaea95e-49b0-11e4-8e3e-201906b94a22.jpeg)

Fixes #6369