[FAB-4996] NodeSDK - move sample - part 2

This is part 2 of the Move Balance-Transfer sample
app from fabric-sdk-node to fabric-samples. This will
remove the sample from fabric-sdk-node and
https://gerrit.hyperledger.org/r/#/c/11177/
adds the sample app to fabric-samples.

Change-Id: I121910830dba3cfe9ad1b5777fac01824691f8b5
Signed-off-by: Bret Harrison <beharrison@nc.rr.com>

.gitignore

@@ -3,7 +3,6 @@ docs/gen
 node_modules/*
 fabric-client/node_modules/*
 fabric-ca-client/node_modules/*
-examples/balance-transfer/node_modules/*
 fabric-ca-client/lib/api.js
 fabric-ca-client/lib/utils.js
 fabric-ca-client/lib/BaseClient.js