Mark Elastic Transcoder required params.
Remove Tags key from CreateSnapshot response

This is not supported by the API and was a mistake
in our model:

http://docs.aws.amazon.com/AWSEC2/latest/APIReference/ApiReference-query-CopySnapshot.html
Merge branch 'ec2-tags-remove' into develop

* ec2-tags-remove:
  Remove Tags key from CreateSnapshot response
Merge pull request #246 from danielgtaylor/elastictranscoder-required-args

Mark Elastic Transcoder required params. Fixes #214, #246.
Add Cloudfront required params
Merge pull request #248 from danielgtaylor/cloudfront-required

Mark Cloudfront required params. Fixes #248.
Make pagination test more robust

Try a couple of times (up to 5) before failing the test.
This should make this integ test more robust.
Merge branch 's3-integ-page' into develop

* s3-integ-page:
  Make pagination test more robust
Reintroduce #221

Fixes aws/aws-cli#614.
Reintroduce handler unit tests

Originally from: 59c6cd9
Merge branch 'plus-s3-copy' into develop

* plus-s3-copy:
  Reintroduce handler unit tests
  Reintroduce #221
Update Elastic Transcoder with correct set of available regions
Merge branch 'transcoder-regions' into develop

* transcoder-regions:
  Update Elastic Transcoder with correct set of available regions
Update ELB model to latest version
Update kinesis model with latest docs
Update dep on jmespath to latest version
Bumping version to 0.35.0
Merge branch 'release-0.35.0' into develop

* release-0.35.0:
  Bumping version to 0.35.0
  Update dep on jmespath to latest version
  Update kinesis model with latest docs
  Update ELB model to latest version
Mark CloudFormation required param
Merge pull request #253 from danielgtaylor/cf-required

Mark CloudFormation required param. Fixes #253.