do not include change addresses in #getAddresses by default

lib/server.js

@@ -289,11 +289,11 @@ WalletService.prototype.getMainAddresses = function(opts, cb) {
 
   self.storage.fetchAddresses(self.walletId, function(err, addresses) {
     if (err) return cb(err);
-    var mainAddresses = _.filter(addresses, {
-      isChange: false
-    });
 
-    return cb(null, mainAddresses);
+    var onlyMain = _.reject(addresses, {
+      isChange: true
+    });
+    return cb(null, onlyMain);
   });
 };