dynamodb: Fix AddUpdates() to build UpdateItem() query properly

See also: http://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_UpdateItem.html
dynamodb: go fmt
Merge pull request #48 from nabeken/dynamodb-fix-update-item

dynamodb: fix broken query for UpdateItem
Add USGovWest region
Added ability to query block devices of EC2 instances. Added ability to specify block device mappings when creating EC2 instances
Merge pull request #49 from darrendao/master

Add USGovWest region
Merge remote-tracking branch 'upstream/master'