consolidate git-churn into gitconfig

bin/git-churn

@@ -1,23 +0,0 @@
-#!/bin/bash
-#
-# Written by Corey Haines
-# Scriptified by Gary Bernhardt
-#
-# Put this anywhere on your $PATH (~/bin is recommended). Then git will see it
-# and you'll be able to do `git churn`.
-#
-# Show churn for whole repo:
-#   $ git churn
-#
-# Show churn for specific directories:
-#   $ git churn app lib
-#
-# Show churn for a time range:
-#   $ git churn --since='1 month ago'
-#
-# (These are all standard arguments to `git log`.)
-
-set -e
-git log --all -M -C --name-only --format='format:' "$@" | sort | grep -v '^$' | uniq -c | sort | awk 'BEGIN {print "count\tfile"} {print $1 "\t" $2}' | sort -g
-
-