Added git-update-extras

Makefile

@@ -11,6 +11,7 @@ BINS = \
 	git-commits-since \
 	git-summary \
 	git-contrib \
+	git-update-extras \
 	git-release
 
 install:

Readme.md

@@ -19,6 +19,7 @@
  - git release
  - git contrib
  - git repl
+ - git update-extras
 
 ## git-contrib
 
@@ -198,3 +199,7 @@ Listing commits:
     * Passing args to git shortlog
     * Added --all support to git-count
     * Initial commit
+
+## git-update-extras
+
+ Updates git extras. clones the repo to _/tmp/git-extras_, make installs, then cds back to the origin directory.

bin/git-update-extras

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+orig=$PWD
+cd /tmp \
+  && rm -fr ./git-extras \
+  && git clone http://github.com/visionmedia/git-extras.git \
+  && cd git-extras \
+  && make install \
+  && cd $orig \
+  && echo "... update complete"
+