Make backup instead of asking for confirmation

install.sh

@@ -4,7 +4,7 @@ DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 link_config () {
 	local name="$1"
 	echo "Installing $name"
-	ln -si "$DIR/$name" "$HOME/.$name"
+	ln -sb "$DIR/$name" "$HOME/.$name"
 }
 
 if [ ! -d ~/.vim/bundle ]; then