npm webtorrent fails to install.

[jsindy]

npm ERR! not a package /tmp/npm-9-h_MN-pQZ/github.com/jhiesey/mp4box.js.git
npm ERR! Error: ENOENT, open '/tmp/npm-9-h_MN-pQZ/github.com/jhiesey/mp4box.js.git-unpack/package.json'
npm ERR! If you need help, you may report this entire log,
npm ERR! including the npm and node versions, at:
npm ERR! http://github.com/npm/npm/issues

My Dockerfile looks like this

FROM ubuntu:14.04.3
RUN apt-get update
RUN apt-get -y install vim curl wget
RUN curl -sL https://deb.nodesource.com/setup | sudo bash -
RUN apt-get -y install nodejs build-essential python-dev python
RUN npm install webtorrent -g

[jsindy]

duplicate of #468