create basic version of ListResourceRecordSets method
add params processing to ListResourceRecordSets
add more fields to recordset
ec2: Correctly refresh IAM credentials.

Analogous to the patch to sqs in #111.
Merge pull request #134 from nelhage/ec2-refresh

ec2: Correctly refresh IAM credentials.
dynamodb: scan support for large data sets
Merge pull request #138 from abursavich/master

dynamodb: scan support for large data sets
Refactoring ChangeResourceRecordSetsRequest to match the spec and simplifying ListHostedZonesResponse
Make sure ChangeResourceRecordSet complies with the spec
Adding Route53 change batch support
Add support for Message Attributes
Don't run check for attribute MD5 unless we pass message attributes
Merge pull request #141 from hayesgm/master

Add support for Message Attributes
Add DelaySeconds to the Message struct.
Use Message.DelaySeconds in SendMessageBatch to set individual message delay in the batch.
Merge pull request #142 from zoips/message-delay

Enable individual message delay for SendMessageBatch
Explicitly close the response body, otherwise if ignored it causes a file i/o leak
Merge pull request #143 from hailocab/ioleak

Fix File I/O Leak
Use AWS Signature v4 in SQS. Among other things this enables support for 256 KiB payloads.
Remove pointer to Error so that dynamodb.Error impelents error correctly.
Merge pull request #146 from leelynne/master

Remove pointer to Error so that dynamodb.Error impelents error correctly...