Added support for passing a URI (tcp:// http:// unix:// etc.) for the -s...

It does require changing the current behaviour of passing only the path, to passing unix:///docker.sock. 
The benefit being that it will work for other URIs as well (e.g. tcp://172.17.42.1:4243).

Who knows, maybe some weirdo is binding the docker daemon only to his network interfaces... 

:cake: