Merge pull request #23 from vinodc/s3gateway-us-west-2

Update S3Gateway to add us-west-2

Author: kimchy

src/main/java/org/elasticsearch/gateway/s3/S3Gateway.java

@@ -68,6 +68,8 @@ public S3Gateway(Settings settings, ThreadPool threadPool, ClusterService cluste
                     region = "us-west-1";
                 } else if ("us-west-1".equals(regionSetting.toLowerCase())) {
                     region = "us-west-1";
+                } else if ("us-west-2".equals(regionSetting.toLowerCase())) {
+                    region = "us-west-2";
                 } else if ("ap-southeast".equals(regionSetting.toLowerCase())) {
                     region = "ap-southeast-1";
                 } else if ("ap-southeast-1".equals(regionSetting.toLowerCase())) {