Started implementing discovery on the phone using the new ec2 server to store public/private ip address mappings. I separated @hwray's new code into the ExploreMusic activity but that means that right now the NewJamActivity doesn't actually display any music, so we will need to integrate those together soon. Note that right now the RequestLocalJam thread is empty but it should be used by the JoinJamActivity to make a GET request to the server to find all local jams associated with the same public ip addr.