Update SqlBulkInsertOperation to use NotifyBatchSize instead of notifyBatchSize.

use the NotifyBatchSize property instead of private variable notifyBatchSize so that it falls back on batchSize if notifyBatchSize isn't provided.  This is so OnSqlRowsCopied works correctly if only batchSize is provided.
Merge pull request #7 from dalenewman/patch-1

Update SqlBulkInsertOperation to use NotifyBatchSize instead of notifyBa...