Update Emacs packages

This is a massive diff that I had to do in a hurry - when leaving
Urbint. I'm pretty sure that most of these are updating Emacs packages,
but I'm not positive.

configs/shared/emacs/.emacs.d/elpa/nix-mode-20180908.2240/nix-edit.el

@@ -0,0 +1,37 @@
+;;; nix-edit.el -- run nix commands in Emacs -*- lexical-binding: t -*-
+
+;; Author: Matthew Bauer <mjbauer95@gmail.com>
+;; Homepage: https://github.com/NixOS/nix-mode
+;; Keywords: nix
+
+;; This file is NOT part of GNU Emacs.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'nix)
+(require 'nix-search)
+
+(defun nix-edit (&optional file attr)
+  "Open the nix log.
+FILE the nix file to load from.
+ATTR the attribute to find in nix expressions."
+  (interactive (list (nix-read-file) nil))
+  (unless attr (setq attr (nix-read-attr file)))
+
+  (let ((stdout (generate-new-buffer "nix-edit"))
+        (process-environment (cons "EDITOR=echo" process-environment))
+	result)
+    (call-process nix-executable nil (list stdout nil) nil
+		  "edit" "-f" file attr)
+    (with-current-buffer stdout
+      (when (eq (buffer-size) 0)
+	(error
+	 "Error: nix edit failed to produce any output"))
+      (setq result (substring (buffer-string) 0 (- (buffer-size) 1))))
+    (kill-buffer stdout)
+    (find-file result)))
+
+(provide 'nix-edit)
+;;; nix-edit.el ends here