Prepare 0.5.0 release

Small fix to properly handle ndnsec identity check message and also update copyright years in several files.

Change-Id: I1fae8749f7d755f4af1ccca519c236480ff3f824
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+Mini-NDN Authors
+=================
+
+The following lists maintainers, primary developers, and all much-appreciated contributors to Mini-NDN in alphabetic order.
+The specific contributions of individual authors can be obtained from the git history of the [official Mini-NDN repository](https://github.com/named-data/mini-ndn).
+If you would like to become a contributor to the official repository, please follow the recommendations in https://github.com/named-data/.github/blob/master/CONTRIBUTING.md.
+
+* Alexander Afanasyev <https://users.cs.fiu.edu/~afanasyev>
+* Muktadir R. Chowdhury <https://github.com/alvyC>
+* Damian Coomes <https://github.com/dmcoomes>
+* ***(Maintainer)*** Saurab Dulal <https://dulalsaurab.github.io>
+* Laqin Fan <https://github.com/laqinfan>
+* ***(Former Maintainer)*** Ashlesh Gawande <https://www.linkedin.com/in/agawande>
+* Nicholas Gordon <https://github.com/gorgonical>
+* Giovanni Grieco <https://github.com/GiovanniGrieco>
+* ***(Maintainer)*** Alexander Lane <https://github.com/awlane>
+* Vince Lehman <http://vslehman.com>
+* Philipp Moll <https://github.com/phylib>
+* Eric Newberry <https://ericnewberry.com>
+* Junxiao Shi <https://cs.arizona.edu/~shijunxiao>
+* Jeff Thompson <https://remap.ucla.edu/jeff-thompson>
+* Yucheng Zhang <https://peterskycloud.wixsite.com/yzportfolio>
+* Italo Valcy S Brito <https://github.com/italovalcy>
+
+
+Technical Advisors
+-------------------
+
+* Lan Wang <http://www.cs.memphis.edu/~lanwang>
+* Beichuan Zhang <http://cs.arizona.edu/~bzhang>
+
+
+The Mini-CCNx team
+-------------------
+
+* Carlos Cabral <https://github.com/carlosmscabral>
+* Caio de Moraes Elias <https://github.com/ocaio>
+* Christian Esteve Rothenberg <http://www.dca.fee.unicamp.br/~chesteve>