Add Christian's git-attic script.

There are times I would have killed to have something like this.

README.md

@@ -78,6 +78,7 @@ If you aren't using any zsh frameworks, or if you're a bash user, do the followi
 
 | Script | Original Source | Description |
 | ------ | --------------- | ----------- |
+| `git-attic` | Christian Neukirchen's [blog](http://chneukirchen.org/blog/archive/2013/01/a-grab-bag-of-git-tricks.html) | Displays a list of deleted files in your repo. The output is designed to be copy’n’pasted: Pass the second field to git show to display the file contents, or just select the hash without ^ to see the commit where removal happened. |
 | `git-big-file` | Mislav Marohnić's [dotfiles](https://github.com/mislav/dotfiles) | Show files in the repo larger than a threshold size |
 | `git-change-author` | Michael Demmer in [jut-io/git-scripts](https://github.com/jut-io/git-scripts/blob/master/bin/git-change-author) | Change one author/email in the history to another |
 | `git-change-log` | John Wiegley's [git-scripts](https://github.com/jwiegley/git-scripts) | turn `git log` output into a complete Changelog for projects that haven't been maintaining one |

bin/git-attic

@@ -0,0 +1,18 @@
+#!/bin/sh
+# git-attic [-M] [PATH] - list deleted files of Git repositories
+#
+# Use -M to not show renamed files, and other git-log options as you like.
+#
+# The output is designed to be copy’n’pasted: Pass the second field to
+# git show to display the file contents, or just select the hash without ^ to
+# see the commit where removal happened
+#
+# Source: http://chneukirchen.org/blog/archive/2013/01/a-grab-bag-of-git-tricks.html
+
+
+git log --raw --no-renames --date=short --format="%h %cd" "$@" |
+ awk '/^[0-9a-f]/ { commit=$1; date=$2 }
+ /^:/ && $5 == "D" { print date, commit "^:" $6 }' |
+ git -p column
+
+set -o pipefail