Move AUTHORS to root (closes #2985)

AUTHORS

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+Ricardo Garcia Gonzalez
+Danny Colligan
+Benjamin Johnson
+Vasyl' Vavrychuk
+Witold Baryluk
+Paweł Paprota
+Gergely Imreh
+Rogério Brito
+Philipp Hagemeister
+Sören Schulze
+Kevin Ngo
+Ori Avtalion
+shizeeg
+Filippo Valsorda
+Christian Albrecht
+Dave Vasilevsky
+Jaime Marquínez Ferrándiz
+Jeff Crouse
+Osama Khalid
+Michael Walter
+M. Yasoob Ullah Khalid
+Julien Fraichard
+Johny Mo Swag
+Axel Noack
+Albert Kim
+Pierre Rudloff
+Huarong Huo
+Ismael Mejía
+Steffan 'Ruirize' James
+Andras Elso
+Jelle van der Waa
+Marcin Cieślak
+Anton Larionov
+Takuya Tsuchida
+Sergey M.
+Michael Orlitzky
+Chris Gahan
+Saimadhav Heblikar
+Mike Col
+Oleg Prutz
+pulpe
+Andreas Schmitz
+Michael Kaiser
+Niklas Laxström
+David Triendl
+Anthony Weems
+David Wagner
+Juan C. Olivares
+Mattias Harrysson
+phaer
+Sainyam Kapoor
+Nicolas Évrard
+Jason Normore
+Hoje Lee
+Adam Thalhammer
+Georg Jähnig
+Ralf Haring
+Koki Takahashi
+Ariset Llerena
+Adam Malcontenti-Wilson
+Tobias Bell
+Naglis Jonaitis
+Charles Chen
+Hassaan Ali
+Dobrosław Żybort
+David Fabijan
+Sebastian Haas
+Alexander Kirk
+Erik Johnson
+Keith Beckman
+Ole Ernst
+Aaron McDaniel (mcd1992)
+Magnus Kolstad
+Hari Padmanaban
+Carlos Ramos
+5moufl
+lenaten
+Dennis Scheiba
+Damon Timm
+winwon
+Xavier Beynon
+Gabriel Schubiner