added hooks in the import service to make a collection of entries during
the SAX parsing.  The collection is used for binding imported usage
points to the Retail Customer for which an authorization/subscription
exists.
mergeOrUpdate was missing the merge of the relatedLinks, causing them to
be dropped when an imported usage point was assigned to a retail
customer.
Merge pull request #9 from jateeter/master

Fixed datacustodian import/assignUsagePoint/ and import into thirdparty