Work around a possible AWS bug in batchGetItem() that is returning
"HashKeyElement" as the key item name in the unprocessedKeys property.
Merge pull request #12 from lpryor/master

Work around a possible AWS bug in batchGetItem()
Merge branch 'master' into bizo-2.10

* master:
  Work around a possible AWS bug in batchGetItem() that is returning "HashKeyElement" as the key item name in the unprocessedKeys property.