After removing build, first run of make node-pdg fails

[ezavada]

Tries to install the package using "npm install (blank)", which it should have the package name.

Incorrect:
-rw-r--r-- 1 ezavada staff 1938416 Jul 10 23:09 /Users/ezavada/pdg/build/node-pdg/pdg-0.9.4.tgz
cd /Users/ezavada/pdg; /Users/ezavada/pdg/tools/npm install

Correct:
-rw-r--r-- 1 ezavada staff 1938416 Jul 10 23:10 /Users/ezavada/pdg/build/node-pdg/pdg-0.9.4.tgz
cd /Users/ezavada/pdg; /Users/ezavada/pdg/tools/npm install /Users/ezavada/pdg/build/node-pdg/pdg-0.9.4.tgz

At very least we need to detect the error condition and tell them to try again.