format-patch/commit: Quote single quote in the author name properly.

Noticed by Kyle McMartin.

Signed-off-by: Junio C Hamano <junkio@cox.net>

git-commit.sh

@@ -165,6 +165,7 @@ then
 	then
 		pick_author_script='
 		/^author /{
+			s/'\''/'\''\\'\'\''/g
 			h
 			s/^author \([^<]*\) <[^>]*> .*$/\1/
 			s/'\''/'\''\'\'\''/g

git-format-patch.sh

@@ -173,6 +173,7 @@ titleScript='
 
 whosepatchScript='
 /^author /{
+	s/'\''/'\''\\'\'\''/g
 	s/author \(.*>\) \(.*\)$/au='\''\1'\'' ad='\''\2'\''/p
 	q
 }'