Moto

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* Fix a regression in S3 url regexes
* APIGateway region fixes
* ECS improvements
* Add mock_cognitoidentity, thanks to brcoding

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The huge change in this version is that the responses library is no longer vendored. Many developers are now unblocked. Kudos to spulec for the fix.

* Fix route53 TTL bug
* Added filtering support for S3 lifecycle
* unvendoring responses

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Dozens of major endpoint additions in this release. Highlights include:

* Fixed AMI tests and the Travis build setup
* SNS improvements
* Dynamodb improvements
* EBS improvements
* Redshift improvements
* RDS snapshot improvements
* S3 improvements
* Cloudwatch improvements
* SSM improvements
* IAM improvements
* ELBV1 and ELBV2 improvements
* Lambda improvements
* EC2 spot pricing improvements
* ApiGateway improvements
* VPC improvements

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* Supports filtering AMIs by self
* Implemented signal_workflow_execution for SWF
* Wired SWF backend to the moto server
* Added url decoding to x-amz-copy-source header for copying S3 files
* Revamped lambda function storage to do versioning
* IOT improvements
* RDS improvements
* Implemented CloudWatch get_metric_statistics
* Improved Cloudformation EC2 support
* Implemented Cloudformation change_set endpoints

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* Implemented Iot and Iot-data
* Implemented resource tagging API
* EC2 AMIs now have owners
* Improve codegen scaffolding
* Many small fixes to EC2 support
* CloudFormation ELBv2 support
* UTF fixes for S3
* Implemented SSM get_parameters_by_path
* More advanced Dynamodb querying

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* Implemented Batch
* Fixed regression with moto_server dashboard
* Fixed and closed many outstanding bugs
* Fixed serious performance problem with EC2 reservation listing
* Fixed Route53 list_resource_record_sets