Use the region in a definition when instanciating AWS Client objects
Use the region in a definition when instanciating AWS Client objects

If we already defined the region in the following locations, hako works well.
- ENV['AWS_REGION']
- Aws.config[:region]
(ref: http://docs.aws.amazon.com/sdkforruby/api/Aws/SNS/Client.html)

However, we already defined the region in scheduler section of configuration file.
We should use it.

eagletmt/hako,eagletmt/hako,eagletmt/hako