Added a few example based on the obsolete libraries (v0).

Updated the tutorial example.
Added WSF_MESSAGE_EXECUTION.

examples/obsolete/v0/restbucksCRUD/src/utils/etag_utils.e

@@ -0,0 +1,24 @@
+note
+	description: "Summary description for {ETAG_UTILS}."
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	ETAG_UTILS
+
+feature -- Access
+
+	md5_digest (a_string: STRING): STRING
+			-- Cryptographic hash function that produces a 128-bit (16-byte) hash value, based on `a_string'
+		local
+			md5: MD5
+		do
+			create md5.make
+			md5.update_from_string (a_string)
+			Result := md5.digest_as_string
+		end
+
+note
+	copyright: "2011-2014, Javier Velilla and others"
+	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
+end