Switch Karma to use PhantomJS to run tests. CI machines no longer
need to have Chrome installed.
Implemented after changes to build process due to imperative registration.
https://github.com/nasa/openmctweb/issues/450
Remove depencendies necessary to build docs from package.json and
specify them in the readme. Due to difficulty managing dependencies
for nomnoml on different platforms, this reduces dependency requirements
to only those needed for building the package.
Add a script (to be executed with `npm run-script watch`) that
runs karma and watches for changes; rerunning tests whenever a
file is changed. Useful for local development.
