initial import of material for public archive into git

We're creating a fresh archive because the history for our old chapter includes
API keys, data files, and other material we can't share.

COPYING

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+Code and paper for "A Computational Analysis of Social Media Scholarship"
+
+This work is copyright (c) 2016-2018 Jeremy Foote, Aaron Shaw, and
+Benjamin Mako Hill.
+
+This archive contains both code and text for a document that was
+published as a book chapter in the "SAGE Handbook of Social
+Media." They are licensed differently:
+
+1. Code for analysis
+
+This code included here is all free software: you can redistribute it
+and/or modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+2. Text of the final paper
+
+The text of the paper is distributed under the Creative Commons
+Attribution-NonCommercial-ShareAlike license:
+
+- Attribution — You must give appropriate credit, provide a link to
+  the license, and indicate if changes were made. You may do so in any
+  reasonable manner, but not in any way that suggests the licensor
+  endorses you or your use.
+
+- NonCommercial — You may not use the material for commercial purposes.
+
+- ShareAlike — If you remix, transform, or build upon the material,
+  you must distribute your contributions under the same license as the
+  original.
+
+No additional restrictions — You may not apply legal terms or
+technological measures that legally restrict others from doing
+anything the license permits.