test sqs with xml characters
XML escape body of sqs message body prior to encoding to XML
ModifyInstanceAttribute: Added support for 'SourceDestCheck.Value'.
Merge pull request #236 from joekiller/fix/sqs_xml_special_characters_in_body

Fix/sqs xml special characters in body
Merge pull request #238 from DreadPirateShawn/ModifyInstanceAttributeSourceDestCheck

ModifyInstanceAttribute: Added support for 'SourceDestCheck.Value'.
Enhance DescribeStacks. Keep track of deleted stacks. Stack status.

Made describe_stacks more in line with http://docs.aws.amazon.com/AWSCloudFormation/latest/APIReference/API_DescribeStackResource.html
Merge pull request #239 from joekiller/enhance/describe_stacks_delete_stacks_stack_status

Enhance DescribeStacks. Keep track of deleted stacks. Stack status.