ignore bin, gen, and some hiddent files
removed original bin and gen folders

bin and gen folders shouldn't be checked into source control - the
previous commit will prevent git from paying attention to them but we
need to get rid of the originals too
added Game, Token, and TokenManager; also empty MakeTokenActivity

Game includes simple enum for games with token strategies; Token is
immutable game token - this is what will be passed around (still need
to work on xlate from NDEF message to token); TokenManager handles the
tokens in memory as well as persisting to sqlite database;
MakeTokenActivity may be used to write to the NFC tags - maybe