Replace NodeSource Node.js install with binary download

The NodeSource repository was removing old versions of Node.js and
replacing it with new versions. This made it difficult (impossible?) to
pin installs to a specific version of Node.js. This changeset attempts
to remedy that by downloading and installing  Node.js binaries directly
from nodejs.org.
0.2.0
Merge branch 'release/0.2.0' into develop