Added start of fenrir client-side application.

Still not sure about directory organization here, but running with it
until I figure out a better way of organizing things.
Renaming bin/fenrir to bin/server.
Using knockout for client application.
Wasn't setting path for client lib correctly for browserify.
Smaller menu looks better.
Renaming dirRoot to be more clear what it represents.
Adding tests for top-level fenrir server object.