support gethostedzone for route53
support multiple nameservers
dynamodb: refactor GetItem, GetItemConsistent
dynamodb: refactor PutItem, DeleteItem
dynamodb: Fix #76 Add conditional {Put,Delete}Item support
Merge pull request #83 from nabeken/dynamodb-conditional-put-delete

dynamodb: Add Dynamodb conditional put delete
Merge pull request #84 from yext/master

support getHostedZone
Added sandbox env for mturk
Have mturk support HTMLQuestion
dynamodb: Add Conditional{Add,Update,Delete}Attributes
Merge pull request #85 from nabeken/dynamodb-conditional-update

dynamodb: Add Conditional{Add,Update,Delete}Attributes
Interface for GetAssignmentsForHIT
Merge pull request #86 from abhiyerra/mturk

Support sandbox env, HTMLQuestion and GetAssignmentsForHIT API.