Added Ruby examples for SQS (chapter 4).

sqs/example1/receive_message.rb

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+require 'rubygems'
+require 'right_aws'
+
+sqs = RightAws::SqsGen2.new("AKIAIGKECZXA7AEIJLMQ",
+                             "w2Y3dx82vcY1YSKbJY51GmfFQn3705ftW4uSBrHn")
+
+# create the queue, if it doesn't exist, with a VisibilityTimeout of 120 (seconds)
+images_queue = sqs.queue("images", true, 120)
+
+# now get the messages
+message = images_queue.receive
+
+# process the message, if any
+# the process method is application-specific
+if (process(message.body)) then
+    message.delete
+end

sqs/example1/send_message.rb

@@ -0,0 +1,13 @@
+require 'rubygems'
+require 'right_aws'
+
+# get SQS service with AWS credentials
+sqs = RightAws::SqsGen2.new("AKIAIGKECZXA7AEIJLMQ", 
+                             "w2Y3dx82vcY1YSKbJY51GmfFQn3705ftW4uSBrHn")
+
+# create the queue, if it doesn't exist, with a VisibilityTimeout of 120 (seconds)
+images_queue = sqs.queue("images", true, 120)
+
+# the only thing we need to pass is the URL to the image in S3
+images_queue.send_message( 
+  "https://s3.amazonaws.com/media.kulitzer.com.production/212/24/replication.jpg")