Remove Attribute.attributeDefinition, move to Attribute.Definition.definition
Merge branch 'master' into bizo-2.9.1

* master:
  Remove Attribute.attributeDefinition, move to Attribute.Definition.definition
 - Fixed a bug in pixii.Table that would cause elements of the input
iterator to be skipped in writeBatch() if an exception triggered the
retry policy.
 - Fixed a bug in pixii.fake.FakeDynamoDb that was incorrectly throwing
exceptions when an item in a batch get request was not found.
 - Fixed a bug in pixii.fake.FakeTableWithHashKey that was causing
elements to be stored under the wrong key when inserted using putItem().
Merge pull request #5 from lpryor/master

Bug fixes associated with readBatch() and writeBatch()
Fix HashAndRangeKeyTable.query()
Merge branch 'master' into bizo-2.9.1

* master:
  Fix HashAndRangeKeyTable.query()
  - Fixed a bug in pixii.Table that would cause elements of the input iterator to be skipped in writeBatch() if an exception triggered the retry policy.  - Fixed a bug in pixii.fake.FakeDynamoDb that was incorrectly throwing exceptions when an item in a batch get request was not found.  - Fixed a bug in pixii.fake.FakeTableWithHashKey that was causing elements to be stored under the wrong key when inserted using putItem().