[git] Add ctags hooks for git

Taken from here:
http://tbaggery.com/2011/08/08/effortless-ctags-with-git.html

git/.git_templates/hooks/ctags

@@ -0,0 +1,8 @@
+#!/bin/sh
+set -e
+PATH="/usr/local/bin:$PATH"
+dir="`git rev-parse --git-dir`"
+trap 'rm -f "$dir/$$.tags"' EXIT
+git ls-files | \
+  ctags --tag-relative -L - -f"$dir/$$.tags" --languages=-javascript,sql
+mv "$dir/$$.tags" "$dir/tags"

git/.git_templates/hooks/post-checkout

@@ -0,0 +1,2 @@
+#!/bin/sh
+.git/hooks/ctags >/dev/null 2>&1 &

git/.git_templates/hooks/post-commit

@@ -0,0 +1,2 @@
+#!/bin/sh
+.git/hooks/ctags >/dev/null 2>&1 &

git/.git_templates/hooks/post-merge

@@ -0,0 +1,2 @@
+#!/bin/sh
+.git/hooks/ctags >/dev/null 2>&1 &

git/.git_templates/hooks/post-rewrite

@@ -0,0 +1,4 @@
+#!/bin/sh
+case "$1" in
+  rebase) exec .git/hooks/post-merge ;;
+esac