DOC Add authors file as well as script to create it.

AUTHORS

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+Eddie Hebert
+fawce
+Thomas Wiecki
+Stephen Diehl
+scottsanderson
+Scott Sanderson
+Richard Frank
+Jonathan Kamens
+twiecki
+Joe Jevnik
+Delaney Granizo-Mackenzie
+Tobias Brandt
+Ben McCann
+John Ricklefs
+Jenkins T. Quantopian, III
+Jeremiah Lowin
+jbredeche
+Brian Fink
+David Edwards
+Matti Hanninen
+Ryan Day
+llllllllll
+David Stephens
+Tim
+Dale Jung
+Jamie Kirkpatrick
+Jean Bredeche
+Wes McKinney
+jikamens
+Aidan
+Colin Alexander
+Elektra58
+Jason Kölker
+Jeremi Joslin
+Luke Schiefelbein
+Martin Dengler
+Mete Atamel
+Michael Schatzow
+Moises Trovo
+Nicholas Pezolano
+Pankaj Garg
+Paolo Bernardi
+Peter Cawthron
+Philipp Kosel
+Suminda Dharmasena
+The Gitter Badger
+Tony Lambiris
+Tony Worm
+stanh

etc/create_authors_file.sh

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+#!/bin/bash
+git shortlog -ns master | awk '$1 >= $THRESHOLD {$1="";print $0}' | \
+    cut -d" " -f2- > AUTHORS