Tracking, chat, ignore, announce  functionality seems to work. Not use-tested much.

The tracking uses John Magliacane's KD2BD Predict on the back end.  The output is then written
to the MongoDB and made available to clients through publish/subscribe.

The output from Predict is in integer degrees for az,el,lat,lon and that rounding or truncation causes
numerical accuracy issues when determining satellite position and altitude from slant range, QTH, and az/el.

Future versions may either enhance or replace the Predict back end in order to get more data about the satellites
into the browser.