title: Multitenancy without subdomains
body: <p>It seems like most of the documentation / tutorials that I’ve found about multi-tenanted apps seem to prefer scoping via a subdomain. The old classic-style basecamp probably set the presendent for this, where each user / company would have a <a href="http://mycompany.app.com" rel="nofollow">http://mycompany.app.com</a> address. Apps like Harvest, for example, also do this. </p>
  
  <p>I recently noticed that the new basecamp no longer has company subdomains...</p>
  
  <p>Just wondering what the advantages of scoping through a subdomain are vs. say, scoping the User’s data through a gem like Pundit or CanCan? </p>