Allow running bootstrap.sh with a --force or -f option

This avoids the confirmation prompt.

bootstrap.sh

@@ -2,9 +2,17 @@
 mkdir -p ~/.vim/{backups,swaps,undo}
 cd "$(dirname "$0")"
 git pull
-read -p "This may overwrite existing files in your home directory. Are you sure? (y/n) " -n 1
-echo
-if [[ $REPLY =~ ^[Yy]$ ]]; then
+function doIt() {
 	rsync --exclude ".git/" --exclude ".DS_Store" --exclude "bootstrap.sh" --exclude "README.md" -av . ~
+}
+if [ "$1" == "--force" -o "$1" == "-f" ]; then
+	doIt
+else
+	read -p "This may overwrite existing files in your home directory. Are you sure? (y/n) " -n 1
+	echo
+	if [[ $REPLY =~ ^[Yy]$ ]]; then
+		doIt
+	fi
 fi
-source "$HOME/.bash_profile"
+unset doIt
+source ~/.bash_profile