Add relicense grant for eburkitt

RELICENSE/eburkitt.txt

+# Permission to Relicense under MPLv2 or any other OSI approved license chosen by the current ZeroMQ BDFL
+
+This is a statement by G. Evan Burkitt
+that grants permission to relicense his copyrights in the libzmq C++
+library (ZeroMQ) under the Mozilla Public License v2 (MPLv2) or any other 
+Open Source Initiative approved license chosen by the current ZeroMQ 
+BDFL (Benevolent Dictator for Life).
+
+A portion of the commits made by the Github handle "eburkitt", with
+commit author "Evan Burkitt <evanb@edulinksys.com>", are copyright of G. Evan Burkitt.
+This document hereby grants the libzmq project team to relicense libzmq, 
+including all past, present and future contributions of the author listed above.
+
+G. Evan Burkitt
+2017/04/06
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