Added the license grant for jruffin

RELICENSE/jruffin.md

+# Permission to Relicense under MPLv2
+
+This is a statement by IVU Traffic Technologies AG
+that grants permission to relicense its copyrights in the libzmq C++
+library (ZeroMQ) under the Mozilla Public License v2 (MPLv2).
+
+A portion of the commits made by the Github handle "jruffin", with
+commit author "Julien Ruffin <jur@ivu.de>", are copyright of IVU Traffic Technologies AG.
+This document hereby grants the libzmq project team to relicense libzmq, 
+including all past, present and future contributions of the author listed above.
+
+Henrik Benner
+Head of Department Ticketing Development, IVU Traffic Technologies AG
+2017/05/10