Updated handling of subdomain segments in order to work with Heroku and its subdomain method
Root route is to test for subdomain
Refining subdomain behavior on Heroku.  Tried adding a wildcard CNAME record in DNS
Determining how Heroku 'sees' subdomains
Apparently, Heroku does not provide the request.subdomain value
Corrected some flawed logic
showing subdomain
Preliminary operation with several domains/subdomains and beginnings of the ability to select a sub-domain to register