Updated simple_email_service/identity_spec.rb with tests for #verify_dkim
Updated indentation of simple_email_service/identity_spec.rb
Verify content-length for Net::HTTP responses.

Some downloads from Amazon S3 can be truncated, and Net::HTTP
does not check response body size against the content-length
specified in the response header. This change adds such a check,
which can be toggled on or off (on by default) in the AWS.config.
Use --hide-api private instead of --no-api
Validate that a properly signed message is authentic
Support SubscriptionConfirmation and UnsubscribeConfirmation messages
Add accessors for Token and SubscribeURL
Merge pull request #320 from yabawock/patch-1

Add support for SubscriptionConfirmation and UnsubscribeConfirmation messages in AWS::SNS::Message
Update AWS::DynamoDB documentation example.

Example of table creation in docs did not work, added missing
parameters.
Verify content-length for Net::HTTP responses.

Some downloads from Amazon S3 can be truncated, and Net::HTTP
does not check response body size against the content-length
specified in the response header. This change adds such a check,
which can be toggled on or off (on by default) in the AWS.config.
Update AWS::Core::Configuration documentation.

Document the verify_response_body_content_length parameter.
Update AWS::Core documentation for verifying content length.

Adds matching documentation for new verify content length option
to core.rb
Make possible to use without ActionMailer

I use aws-sdk with background uploading queue, so it makes sense to turn off any unused Rails libraries. It's possible to turn off every Rails specific libraries except ActionMailer, so it works:


```ruby
config.frameworks -= [ :active_record, :active_resource, :action_controller, :action_view]
```

But it doesn't work

```ruby
config.frameworks -= [:action_mailer]
```

The fix makes sure that you load ActionMailer to use it with SNS
Fix S3::Client#get_object with exclusive Range

Fixes #326
Merge pull request #322 from mikhailov/patch-1

Make possible to use without ActionMailer
Merge pull request #306 from kdayton-/typo_fix

Updated simple_email_service/identity_spec.rb with tests for #verify_dkim
Merge pull request #319 from aws/truncation

Verify content-length for Net::HTTP responses.
Updated EMR to use SigV4 and AWS JSON protocol.
API updates for Amazon Redshift.

Adds cluster snapshot identifiers to CopyClusterSnapshot and
DeleteClusterSnapshot. Enables better status reporting for
restoring from snapshots.
Update AWS::SNS::Client API to latest version.

SNS now supports mobile push.