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-log.el

@@ -0,0 +1,36 @@
+;;; nix-log.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)
+(require 'nix-instantiate)
+
+(defun nix-log (file attr)
+  "Open the nix log.
+FILE nix file to parse.
+ATTR attribute to load the log of."
+  (interactive (list (nix-read-file) nil))
+  (unless attr (setq attr (nix-read-attr file)))
+
+  (let* ((drv-file (nix-instantiate file attr))
+         (drv-name (progn
+                     (string-match (format "^%s/\\(.*\\)$" nix-store-dir) drv-file)
+                     (match-string 1 drv-file)))
+         (log-file (format "%s/log/nix/drvs/%s/%s.bz2"
+                           nix-state-dir
+                           (substring drv-name 0 2) drv-name)))
+    (if (file-exists-p log-file)
+        (find-file log-file)
+      (error "No log is available for derivation"))))
+
+(provide 'nix-log)
+;;; nix-log.el ends here