Serializing a list containing binaries doesn't work

[Behery]

When the rosbridge_library.protocol tries to serialize an object, the has_binary function doesn't check for list of binaries; it only checks if the object itself is binary, or if it's a dict that has binary in it.
This caused the serialize function to try and json serialize it (which would fail in that case) and the service call doesn't respond back to the client.