Release v2.1.24 - 2015-09-29

Tag release v2.1.24

References:
#935, #937

• Feature - Aws::SES - Amazon SES can now accept incoming emails. You can
  configure Amazon SES to deliver messages to an Amazon S3 bucket, call an AWS
  Lambda function, publish notifications to Amazon SNS, drop messages, or bounce
  messages.
• Feature - Aws::EC2 - Add #modify_spot_fleet_request API to Amazon EC2 client
  and bump API version to 2015-10-01.
• Feature - Aws::CloudFormation - Add #describe_account_limits API to allow
  users to view account-level limits imposed by AWS CloudFormation. Also adds
  optional parameter :resource_types to #create_stack and #update_stack
  APIs.