Channels fix (#5)

- Fix bug when destination invokes payment (wrong pubkeys in OP_RETURN - validation would fail)
- Added channelslist RPC
- Changed channelsinfo data to JSON format

src/rpc/server.cpp

@@ -394,6 +394,7 @@ static const CRPCCommand vRPCCommands[] =
 
     // Channels
     { "channels",       "channelsaddress",   &channelsaddress,   true },
+    { "channels",       "channelslist",      &channelslist,      true },
     { "channels",       "channelsinfo",      &channelsinfo,      true },
     { "channels",       "channelsopen",      &channelsopen,      true },
     { "channels",       "channelspayment",   &channelspayment,   true },