Move to using Amazon Signer, rather than reimplementing.

lib/aws_paa.rb

@@ -1,5 +1,7 @@
 require "aws_paa/version"
 
+require 'aws_paa/locales'
+require 'aws_paa/aws_request'
 require 'aws_paa/client'
 require 'aws_paa/request'
 require 'aws_paa/response'
@@ -7,5 +9,4 @@ require 'aws_paa/response'
 module AwsPaa
   class Error < StandardError; end
   class NotImplemented < StandardError; end
-  # Your code goes here...
 end