Added git-squash

Readme.md

@@ -25,6 +25,7 @@ $ brew install git-extras
 ## Commands
 
  - `git extras`
+ - `git squash`
  - `git summary`
  - `git changelog`
  - `git commits-since`
@@ -202,6 +203,10 @@ $ git commits-since yesterday
 TJ Holowaychuk - Fixed readme
 ```
 
+## git-squash [msg]
+
+ Squashes the current branch into a single commit with the given `[msg]`.
+
 ## git-count
 
 Output commit count:

bin/git-squash

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+# TODO: warn on master
+
+branch=`git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/'`
+msg=${1-Squashed $branch}
+git checkout -b squash-tmp master \
+  && git merge --squash $branch \
+  && git commit -m $msg \
+  && git branch -M $branch