v2: Updates

* Simplifies & beautifies everything
* Introduces a new Class system.
* Errors are defaulted to AWS's handler.
* New function names & more efficient handling.
* Should fix a majority of the errors.

Please read the README for more!

aws/Aws/Signature/SignatureInterface.php

@@ -39,6 +39,7 @@ interface SignatureInterface
     public function presign(
         RequestInterface $request,
         CredentialsInterface $credentials,
-        $expires
+        $expires,
+        array $options = []
     );
 }