deps: import acorn@5.2.1

Imported from the tarball published on npm
(https://registry.npmjs.org/acorn/-/acorn-5.2.1.tgz).

PR-URL: #15566
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

LICENSE

@@ -51,6 +51,29 @@ maintained libraries.
 
 The externally maintained libraries used by Node.js are:
 
+- Acorn, located at deps/acorn, is licensed as follows:
+  """
+    Copyright (C) 2012-2017 by various contributors (see AUTHORS)
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in
+    all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+    THE SOFTWARE.
+  """
+
 - c-ares, located at deps/cares, is licensed as follows:
   """
     Copyright (c) 2007 - 2016, Daniel Stenberg with many contributors, see AUTHORS

deps/acorn/AUTHORS

@@ -0,0 +1,69 @@
+List of Acorn contributors. Updated before every release.
+
+Adrian Rakovsky
+Alistair Braidwood
+Amila Welihinda
+Andres Suarez
+Angelo
+Aparajita Fishman
+Arian Stolwijk
+Artem Govorov
+Bradley Heinz
+Brandon Mills
+Charles Hughes
+Conrad Irwin
+Daniel Tschinder
+David Bonnet
+Domenico Matteo
+ehmicky
+Forbes Lindesay
+Gilad Peleg
+impinball
+Ingvar Stepanyan
+Jackson Ray Hamilton
+Jesse McCarthy
+Jiaxing Wang
+Joel Kemp
+Johannes Herr
+John-David Dalton
+Jordan Klassen
+Jürg Lehni
+Kai Cataldo
+keeyipchan
+Keheliya Gallaba
+Kevin Irish
+Kevin Kwok
+krator
+Marek
+Marijn Haverbeke
+Martin Carlberg
+Mat Garcia
+Mathias Bynens
+Mathieu 'p01' Henri
+Matthew Bastien
+Max Schaefer
+Max Zerzouri
+Mihai Bazon
+Mike Rennie
+naoh
+Nicholas C. Zakas
+Nick Fitzgerald
+Olivier Thomann
+Oskar Schöldström
+Paul Harper
+Peter Rust
+PlNG
+Prayag Verma
+ReadmeCritic
+r-e-d
+Richard Gibson
+Rich Harris
+Sebastian McKenzie
+Shahar Soel
+Simen Bekkhus
+Teddy Katz
+Timothy Gu
+Toru Nagashima
+Victor Homyakov
+Wexpo Lyu
+zsjforcn