Upgrade NPM

This changeset upgrades the version of NPM from 1.4.28 to 2.1.14. Joyent
bundles Node.js with the current version of NPM at time of release. In
our case, 0.10.32.

Locally, this change appears to have increased the probability of build
success. I'm going to do more testing, but putting this up here so that
others can confirm.
Remove internally symlinked node_modules

This changeset removes a hack to symlink a directory inside the
application server virtual machine into the Vagrant synced folder (to
accommodate NPM when the virtual machine host is Windows).

Now, the Vagrant synced folders use VirtualBox for non-Windows virtual
machine hosts and `rsync` for Windows virtual machine hosts.
Merge branch 'feature/hmc/upgrade-npm' into develop