add missing route53 autodoc
fix param error in doc
Merge pull request #2343 from zihaoyu/route53_autodoc

Add missing route53 autodoc. Fixes #2343.
Switch boto to use truncated exponential backoff
Add S3 sigv4 presigning
Merge pull request #2349 from danielgtaylor/s3v4-presign

Add S3 SigV4 Presigning. Fixes #2349.
Add T2 instance types to EC2
Add new regions for CloudTrail and Kinesis