cargomedia.bind not running - add listening on port 55 to bind

While helping @vogdb run his virtual network with Android Emulator (see https://github.com/cargomedia/sk/issues/1041#issuecomment-67824745) and a vm running Windows, I realized that `bind` is not running on my machine.

Cross-check with @kris-lab and @christopheschwyzer resulted in a puzzling confirmation that no one seems to have `bind` running on his local machine - which is a prerequisite to be able to forward DNS requests to landrush (see https://github.com/cargomedia/osx-setup/pull/24 and https://github.com/phinze/landrush/tree/master/doc/proxy-mobile)

There are two problems (and two solutions):
- For `bind` not running: (file `named.ca` is missing) - adding `named.ca` it and restarting `bind`
- For Android Emulator wanting to use a dns server on port 55: add port 55 to bind config

Note: It seems it quite weird to me that port 55 is expected to be a DNS server. Since it does not affect our operations (it's a local and virtual network, anyway), I advocate just adding it.