Troposphere

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* In SpotFleet::SpotFleetRequestConfigData SpotPrice is optional
* Add RoutingConfig to AWS::Lambda::Alias
* Update AWS::CodeDeploy
* Add CodeDeployLambdaAliasUpdate to UpdatePolicy
* Add AWS::GuardDuty
* Add AWS::Cloud9
* Add initial python resource spec generator
* Update AWS::CodeBuild::Project to 20171201 changes
* Change AWS::Batch::ComputeResources.Tags type to dict (867)
* Update README for YAML template (925)
* Typo fix in examples/ElastiCacheRedis.py (926)
* Adds Fargate support to ECS types (929)
* Fix SSM NotificationConfig validator type (930)
* Fix SQS::Queue validation in the case of no QueueName specified (931)

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* Add support for VPCOptions in ElasticSearch (862)
* Add Description property for security group ingress and egress (910)
* Add QueryLoggingConfig to Route53::HostedZone
* Add SourceRegion to RDS::DBInstance
* Add RootVolumeSize and caleDownBehavior to EMR::Cluster
* Add new properties to ElastiCache::ReplicationGroup
* Add LinuxParameters to ECS::TaskDefinition ContainerDefinitions
* Add LifecyclePolicy to ECR::Repository
* Add ScheduledActions to ApplicationAutoScaling::ScalableTarget
* Add new properties into ApiGateway

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* Output yaml (to_yaml) using cfn_flip (Fixes 567)
* Allow AWSHelperFn for CodeCommit Trigger Event(s) (869)
* Adding the AWS::Glue resources (872)
* Use a list for Serverless::Function Tags (873)
* Support ProcessingConfiguration for Elasticsearch and Redshift (876)
* Fixes incorrect class definition. (877)
* Add TargetGroupInfo to DeploymentGroup 884 (895)
* Reverting 810 as AWS has changed the casing again (896)
* Add EMR Cluster MasterInstanceFleet and CoreInstanceFleet properties (897)
* Add EMR Cluster CustomAmiId (888) (898)
* Add SecurityGroupRule Description property (885) (899)
* Add support for tags in AWS::KMS::Key. (900)
* Adding OriginReadTimeout aka OriginResponseTimeout to cloudfront origin settings (901)
* Added property for OriginKeepaliveTimeout
* Add CloudFrontOriginAccessIdentity type (903)
* Added support for VpnTunnelOptionsSpecifications (904)
* Allow ref on Parameter (905)
* Adds Tags to Cloudfront Distribution (906)
* CloudFront: add IPV6Enabled property for DistributionConfig (908)
* Add OptionVersion to RDS:OptionConfigurations
* Add Tags to OpsWorks Layer and Stack
* Add LifecycleHookSpecification in AutoScalingGroup
* Add AmazonSideAsn to EC2::VPNGateway
* Add StateMachineName to StepFunctions::StateMachine
* Change KMS::Key to accept a standard Tags
* Add LambdaFunctionAssociations to CloudFront CacheBehaviors
* Add ResourceName to elasticbeanstalk OptionSettings
* Add AnalyticsConfigurations and InventoryConfigurations to S3::Bucket
* Add RequestValidatorId and OperationName to ApiGateway::Method
* Add deprecation warning for StageName in ApiGateway StageDescription
* Add AWS::CloudFront::StreamingDistribution

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* Set EC2 BlockDeviceMapping NoDevice property to type dict (866)

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* Allow s3.Bucket AccessControl to be an AWSHelperFn
* Add AWS::ElasticLoadBalancingV2::ListenerCertificate
* Add serverless FunctionName and change how Tags are implemented
* Make AdjustmentType an optional property of ScalingPolicy as it is not used/supported for target (849)
* Add maintenance window for SSM (851)
* Add Tags, Tracing, KmsKeyArn, DLQ to serverless(SAM) (853)
* Add new AWS::SSM resources (854)
* EC2 NoDevice should be type boolean not dict (858)
* Fixes RecordColumns cardinality for InputSchema and ReferenceSchema (859)
* Make AWS::Batch::JobQueue::JobQueueName optional (860)
* Fixes ApplicationOutput/Output cardinality (863)

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* Note: the s3.Bucket change (844) *may* cause a breaking change for non*named arguments.
* Add DefinitionBody to serverless API (822)
* Adding kinesis stream source to firehose (823)
* Add `Event::Rule::Target::EcsParameters` (824)
* Add S3 Transfer Acceleration to AWS::S3::Bucket (833)
* Add AvailabilityZone property to TargetDescription (834)
* Add Tags to NATGateway (835)
* Add ResourceLifecycleConfig to ElasticBeanstalk (836)
* Add AWS::Athena::NamedQuery (837)
* Added platformArn to Environment and ConfigurationTemplate (839)
* Events target (fixes 830) (840)
* Refactor s3.Bucket to remove custom __init__() and add tests (844)
* Be more explicit on the use of the Tags object for Tags (845)