scripts: Add global git checkout script

scripts/checkout.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+checkout_if_exists() {
+	if [ -d $1 ]; then
+		pushd $1 >/dev/null
+		git checkout $2
+		popd >/dev/null
+	fi
+}
+
+
+checkout_if_exists . $1
+checkout_if_exists module/MonarcCore $1
+checkout_if_exists module/MonarcBO $1
+checkout_if_exists module/MonarcFO $1
+checkout_if_exists node_modules/ng_backoffice $1
+checkout_if_exists node_modules/ng_client $1
+checkout_if_exists node_modules/ng_anr $1