Merge pull request #4 from github/remove-deprecated-digest

Remove deprecated Digest::Digest

lib/aws/s3/authentication.rb

@@ -68,7 +68,7 @@ module AWS
           memoized :canonical_string
 
           def encoded_canonical
-            digest   = OpenSSL::Digest::Digest.new('sha1')
+            digest   = OpenSSL::Digest.new('sha1')
             b64_hmac = [OpenSSL::HMAC.digest(digest, secret_access_key, canonical_string)].pack("m").strip
             url_encode? ? CGI.escape(b64_hmac) : b64_hmac
           end