+ started to modify signatures and the base aws client
+ started implementing Signature Version 4 Signing Process (http://docs.aws.amazon.com/general/latest/gr/signing_aws_api_requests.html)
+ added sqsclient.py base, to work on it together with the signature development
+ added awsutils/utils/auth.py
-refactoring everything related to request
+amazon authentication is encapsulated in awsutils/utils/auth.py (because I want this routines used in a callback based connector, possibly based on tornado)
+s3 functions are working again
+started to work on the sqsclient.py