* describe_task_definition support
* Refactor fetch_task_definition
* Add ECS Descriptors (#772)
* Add support for "DescribeServices" in ecs mock
* Add support for "DescribeTaskDefinition" in ecs
* Let ecs responses handle baseobject for services
* Update Cloudformation/parsing#load_parameters to split commadelimitedlists into lists (#774)
* Fix JSON dump error in ecs.update_service with task_definition (#775)
* Fix s3bucketpath handling for IP based requests (#765)
* check HTTP header for IPv4 or IPv6 addresses and default to path based S3
* improved IPv4 and IPv6 checking with optional ports
* typo
* Freezetime.
* Add S3 ACL for aws-exec-read. Closes#740.
* Fixed time formatting in ec2/models.py (#778)
* Fixed time formatting in ec2/models.py
* Used freezegun on test that was failing due to time progression causing timestamp differences.
* rename duplicate rds/models db_instance_identifier to physical_resource_id (#776)
* rename duplicate db_instance_identifier to physical_resource_id
* Update create_from_cloudformation_json to use db_source_identifier str
* Update code to be more conventional.
* describe_task_definition support
* Refactor fetch_task_definition
