Add support for ap-south-1 region in S3Configuration object

[g-srinivas]

object S3Configuration {
val regionEndpoints = Map(
"us-east-1" -> "s3.amazonaws.com",
"us-west-1" -> "s3-us-west-1.amazonaws.com",
"us-west-2" -> "s3-us-west-2.amazonaws.com",
"eu-west-1" -> "s3-eu-west-1.amazonaws.com",
"eu-central-1" -> "s3-eu-central-1.amazonaws.com",
"ap-southeast-1" -> "s3-ap-southeast-1.amazonaws.com",
"ap-southeast-2" -> "s3-ap-southeast-2.amazonaws.com",
"ap-northeast-1" -> "s3-ap-northeast-1.amazonaws.com",
"sa-east-1" -> "s3-sa-east-1.amazonaws.com"
)
....
}

[EECOLOR]

Related to #63