Add dispatchModule handler to handle module-specific requests

Add a new route and handler to handle module-specific requests.  This handler makes a query and see if a given user already has a specified auth rule set up or not.  If so, we'll redirect the request to /<module_name>/auth', otherwise, '/<module_name>/setup'. 

Please note that I added two ejs files for face authentication just to test out this logic.  We can remove or move these files once we have a working auth module ready.

@krulwich, @suprbh, @ceg1236 - please review.