Troposphere

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* Add support for latest Cloudwatch alarms properties (694)
* Raise ValueError for Outputs and Mappings * Fix Issue 732 (733)
* Add AWS::EMR::SecurityConfiguration support (738)
* Create CODE_OF_CONDUCT.md (740)
* Added UsagePlans to API Gateway example (741)
* EMR AutoScaling Complex Validation and Introduction of an ignore validator type (743)
* Add PrivilegedMode option to CodeBuild Environments (744)
* EFS DependsOn Ref to object fix (746)
* README * add syntax highlighting (747)
* Make handling of DependsOn more pythonic (748)
* Accept Join type as parameter default value as it returns a string (752)
* AWS SAM support (754)
* Fixed UsagePlan example to proper Ref (755)
* Fix cognito StringAttributeConstraints property names (Fixes 756)
* Add 'SourceAuth' property to CodeBuild Source (758)
* Make it easier to get at hidden attributes (Fixes 760)
* Size/IOPS should be positive_integers (761)
* Check that FIFO Queues end with .fifo (757)
* Add AWS::CloudWatch::Dashboard (Fixes 763)
* Ulimit's HardLimit and SoftLimit validator change (764)
* Adding EgressOnlyInternetGateway to EC2::Route (765)
* Allow passing in a dict into DashboardBody (767)
* Handle SQS QueueName using an AWSHelperFn (Fixes 773)
* LifecycleHook NotificationTargetARN and RoleARN are now optional
* Remove RoleArn from Events::Rule and add to Target property
* Add TracingConfig property to AWS::Lambda::Function
* Add Tags to some RedShift resources
* Add AWS::ApiGateway::DomainName
* Add AWS::EC2::EgressOnlyInternetGateway
* Add AWS::EMR::InstanceFleetConfig
* Add BinaryMediaTypes to ApiGateway::RestApi
* Add TargetTrackingScalingPolicyConfiguration
* Add TrailName to CloudTrail::Trail
* Add AlarmConfiguration and TriggerConfigurations
* Add Tags and TimeToLiveSpecification to DynamoDB::Table
* Add RetentionPeriodHours to Kinesis::Stream
* Add ReplicationSourceIdentifier to RDS::DBCluster
* Add LoggingProperties to Redshift::Cluster
* Add AWS Database Migration Service (DMS) support
* Add test target to Makefile
* Make it easier to download the latest CF resource spec
* Added and reverted out of this release:
* Fix pycodestyle issue in tests/test_yaml.py
* Output yaml (to_yaml) using cfn_flip (Fixes 567)
* Special case If during parameter checking (Fixes 772)
* Raise TypeError when a scaler AWSHelperFn is used in a list context (751)

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* Fix typo in S3_Bucket.py example (696)
* Added .Ref & .GetAtt helper methods (697)
* Add Pseudo Parameter Ref objects (698)
* Fix NamespaceType typo in codebuild::Artifacts() (fixes 701)
* Add IpAddressType property to elbv2. (703)
* Add new AWS::Lambda::Function Tags support (705)
* Added ECS PlacementConstraints, PlacementStrategy, and ServiceName (706)
* Add missing CidrIpv6 property to securityrule. (710)
* Add missing properties to various objects in ec2.py (711)
* logs.LogGroupRetentionInDays is strictly defined list (712)
* Add ManagedPolicyName to AWS::IAM::ManagedPolicy (Fixes 714)
* Add better validations for Parameter Default types (Fixes 717)
* Add AWS::Cognito (fixes 720)
* Add required attribute, JobFlowId, to EMR::InstanceGroupConfig (722)
* Add WAFRegional support (723)
* fix for ElastiCacheRedis.py example to use awacs (725)
* Add EMR autoscaling (729)
* Add SshUsername to AWS::OpsWorks::UserProfile
* Add PlacementConstraints to AWS::ECS::TaskDefinition
* Add MaximumExecutionFrequency to Config SourceDetails

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* Fix pycodestyle by using an explicit exception type
* Add more details to pycodestyle errors for travis runs
* Fix validator function exception test
* Remove limit check on conditions * Fixes 657
* Allow valid value for TargetGroup HealthCheckPort (659)
* Added step functions and basic tests (661)
* Adding example for CloudTrail (from http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws*resource*cloudtrail*trail.html) (#667)
* Fix ApiGateway.py sample (666)
* Update comment on type checking
* Added missing props to ec2.NetworkInterfaces (669) (670)
* Add WAF Common Attacks Sample (675)
* Updated constants with new instance types (674)
* SSM Targets * fix spelling mistake (Value => Values) (673)
* Do json validation on ApiGateway::Model Schema (Fix 679) (681)
* SQS: Add FifoQueue and ContentBasedDeduplication (687)
* VPCPeeringConnection: add PeerOwnerId & PeerRoleArn (688)
* IAM: Add InstanceProfileName to InstanceProfile (689)
* Add ApiGateway UsagePlanKey resource
* Add DeadLetterConfig property to Lambda::Function
* Add new subproperties to route53 and redshift (690)
* Route53: ChildHealthChecks is a list of strings (690)
* Fix typo in S3_Bucket_With_Versioning_And_Lifecycle_Rules.py (693)
* Allow a dict to be passed in to initalize Tags (692)
* Add SSM::Parameter
* Update autoscaling example to remove rebinding (695)

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* Extra template validation (635)
* Update ECS to Jan 17, 2017 release (642)
* Add Timezone property to DBInstance (643)
* Test Python 3.6 (644)
* Adding RDS engine support for oracle*se2 (646)
* Correct required in ecs.Service (645)
* Add Separator property to IoT Firehose Action
* Add Fn::Split function (647)
* Added to_dict() method to troposphere.Template (651)
* Allow use of AWSHelperFn for IOPS (652)
* Allow HelperFN w/ autoscaling policies (654)

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* Improve readability of AssumeRolePolicyDocument attribute (591)
* Add Environment to Lambda Function (616)
* Adding DataSources to OpsWorks App and RdsDbInstances to OpsWorks Stack (621)
* Added SNS::Subscription resource (SubscriptionResource) (622)
* Added CodeBuild Project resource and a CodeBuild example (624)
* Add back support for Python 2.6 (626)
* Fixed missing add_resource in example Cloudwatch rule (629)
* Create new property Environment for aws lambda Function (631)
* Add KmsKeyArn to Lambda Function
* Add CopyTagsToSnapshot to RDS::DBInstance
* Fix pycodestyle issues with examples/Lambda.py
* Add AWS::SSM::Association
* Add AWS::EC2::SubnetCidrBlock and AWS::EC2::VPCCidrBlock
* Add mutually_exclusive validator
* Add DocumentType to AWS::SSM::Document
* Add OpsWorks Resources: UserProfile and Volume
* Update opsworks per 2016*11*22 changes
* Allow both dict and string for opswork CustomJson
* Add IPv6 support from 2016*12*01 update

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* Note: the dynamodb change below may cause backwards compatibility issues.
There have been deprecation warnings for a while.
* Replace dynamodb module with dynamodb2 (564)
* Add CodeCommit as a supported AWS resource type
* Add update of github Releases page to RELEASE doc
* Update elasticache for 2016*10*12 changes (592)
* Support for S3 Lifecycle Rule property NoncurrentVersionTransitions (596)
* Include resource title in required attr exception (597)
* Added Placement class for the Placement property in LaunchSpecifications. (598)
* Add EFS example (601)
* Add support to old mysql db engine (602)
* Fix typo in Example Allowed Values (603)
* Remove `title` validation. Fixes 428 (605)
* Add support for conditions in cfn2py script (606)
* Added MongoDB default port to constants (608)
* Add HttpVersion prop to DistributionConfig (CloudFront HTTP/2 Support) (609)
* Added missing QueryStringCacheKeys property to CloudFront ForwardedValues (612)
* Add a validator for ELB names (615)