adds batch_put_item functionality to AWS dynamodb + test

lib/fog/aws/requests/dynamodb/batch_put_item.rb

@@ -0,0 +1,30 @@
+module Fog
+  module AWS
+    class DynamoDB
+      class Real
+
+        #request_items has form:
+        #{"table_name"=>
+        #  [{"PutRequest"=>
+        #    {"Item"=>
+        #      {"hash_key"=>{"N"=>"99"},
+        #       "range_key"=>{"N"=>"99"},
+        #       "attribute"=>{"S"=>"hi"}
+        #       }}}, ... ]}
+        # For more information:
+        # http://docs.amazonwebservices.com/amazondynamodb/latest/developerguide/API_BatchWriteItems.html
+        def batch_put_item(request_items)
+          body = {
+            'RequestItems' => request_items
+          }
+
+          request(
+            :body       => MultiJson.encode(body),
+            :headers    => {'x-amz-target' => 'DynamoDB_20111205.BatchWriteItem'}
+          )
+        end
+
+      end
+    end
+  end
+end