Merge pull request #650 from SAML-Toolkits/strip_change

Replace strip! by strip on compute_digest method

Author: pitbulk

lib/xml_security.rb

@@ -177,7 +177,7 @@ def compute_signature(private_key, signature_algorithm, document)
 
     def compute_digest(document, digest_algorithm)
       digest = digest_algorithm.digest(document)
-      Base64.encode64(digest).strip!
+      Base64.encode64(digest).strip
     end
 
   end