Fix DynamoDBv2 tutorial sentence with missing verb.
Merge pull request #1859 from danielgtaylor/ddb-fix

Fix DynamoDBv2 tutorial sentence with missing verb. Fixes #1825, #1859.
Adds support for ELB Attributes and Cross Zone Balancing.
minor doc typo fixes
Merge pull request #1852 from chuegle/develop

Add support for ELB Attributes and Cross Zone Balancing. Fixes #1852.
Merge pull request #1861 from rayrayson/develop

Fix minor CloudTrail documentation typos. Fixes #1861.
Fix error with deleting an open file in s3.Key.get_contents_to_filename. Patch by nmerket on Github.
Merge branch 's3-fix' into develop. Makes sure file is closed before attempting to delete it when downloading an S3 key. Fixes #1791.