Add the ability to query sync responses using the NgIdSet method. See
more at
https://developer.intuit.com/docs/95_deprecated/qbd_v2/qbd_v2_reference/0600_object_reference/syncstatus

Note: I am submitting this because I can't get the SyncStatusParam
method to work, which Intuit themselves acknowledge this to be the case
for QBD v2. The NgIdSet method does work based on my live testing
results.
Merge pull request #126 from minimul/sync-status

Add the ability to query sync responses using the NgIdSet method. See