Frontend dashboard for real-time data visualization

Currently uses Django, might plan to move to Flask. There are two apps:

datasocket: Provides a JS API for accessing information in a Datastore,
streams using Socket.IO.

dashboard: Provides a nice bootstrap interface for creating scopes to
plot data in real time. Uses the websocket connection from the
datasocket.

Both apps can be run together using the runserver_socketio management
command in datasocket, or the apps can be pulled into an existing Django
project by including them.