For now you can still use BTMM.. as long as your home LAN is connected via a public routable IP address.
Or you can setup a system where you do it by port forwarding. The methods are outlined in the article from Tesserax.
I will add one more.. superior method. VPN.
Since Apple no longer makes airports.. they are not really interested in you creating your own cloud.. they want you to use iCloud.. lots of benefits to you.. and of course a really big one for Apple. They make more money!!
If you want VPN access buy a router that supports VPN as your next router purchase. The TC can plug into this as a dumb client. Or you can use USB drive plugged into the router. Almost all the high end domestic routers support some VPN client.. but the better ones.. eg Asus or Synology also support VPN servers. You can then VPN to your home and the client effectively becomes a part of your home network no matter where you are located in the world. This is standard business setup now.. but easy enough to replicate in your home.