Search for devices without logical grouping

[Mange]

This should fix #31. I don't know why sonos.search and sonos.LogicalDevice are used in different places, but I can see that we don't seem to use the err parameter from the second variant, so no value seem to be lost to me.

Of course, just because it works in my setup does not guarantee that new problems aren't introduced. An alternative solution is to keep track of the IP + port pairs we've already set up and not do it more than once if we see any duplicates.

What do you think?

Tip: Append ?w=1 to the URL to see a diff that ignore whitespace changes.

[stephen]

This removes group control capability from airsonos, which is not desirable. Am thinking your second solution likely makes more sense - keeping track of IP/ports to ignore duplicates brought up.