add new functions to for git

bin/git-change-author-info

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+git filter-branch --env-filter '
+OLD_EMAIL="your-old-email@example.com"
+CORRECT_NAME="Your Correct Name"
+CORRECT_EMAIL="your-correct-email@example.com"
+if [ "$GIT_COMMITTER_EMAIL" = "$OLD_EMAIL" ]
+then
+    export GIT_COMMITTER_NAME="$CORRECT_NAME"
+    export GIT_COMMITTER_EMAIL="$CORRECT_EMAIL"
+fi
+if [ "$GIT_AUTHOR_EMAIL" = "$OLD_EMAIL" ]
+then
+    export GIT_AUTHOR_NAME="$CORRECT_NAME"
+    export GIT_AUTHOR_EMAIL="$CORRECT_EMAIL"
+fi
+' --tag-name-filter cat -- --branches --tags

bin/git-mergedetachedheadto

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+DESTBRANCH=$1
+git checkout -b tmp
+git branch -f ${DESTBRANCH:-master} tmp
+git checkout ${DESTBRANCH:-master}
+git branch -d tmp
+git commit -m "Merged detached head into master" .