[Findit] Add iterator and crash_iterator for delta test

appengine/findit/util_scripts/crash_queries/README.md

Index: appengine/findit/util_scripts/crash_queries/README.md
diff --git a/appengine/findit/util_scripts/crash_queries/README.md b/appengine/findit/util_scripts/crash_queries/README.md
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+###################### Set up enviroment variables. #####################
+##!/bin/bash
+#
+## Notice:
+## User should copy the this part to setup_enviroments.sh script and customized 
+## the path values.
+## Source this script to setup the PYTHONPATH and other environment settings for
+## pulling data from datastore App Engine Remote API. Command:
+##   source setup_enviroments.sh
+#
+#SCRIPT_DIR='$( cd '$( dirname '${BASH_SOURCE[0]}' )' && pwd )'
+#
+## The root directory of Findit source code.
+#export FINDIT_ROOT_DIR=$SCRIPT_DIR/../..
+#
+## Since findit doesn't want to cover the tests of
+#export UTIL_SCRIPTS_DIR=$FINDIT_ROOT_DIR/util_scripts
+#
+##Third_party directory under findit.
+#export THIRD_PARTY_DIR=${FINDIT_ROOT_DIR}/third_party
+#
+##Appengine SDK directory of infra repo.
+#APPENGINE_SDK_DIR=${FINDIT_ROOT_DIR}/../../../google_appengine
+#
+#if [[ $PYTHONPATH != *$APPENGINE_SDK_DIR* ]]
+#then
+#  export PYTHONPATH=$UTIL_SCRIPTS_DIR:$FINDIT_ROOT_DIR:$THIRD_PARTY_DIR:$APPENGINE_SDK_DIR
+#fi
+#
+## This MUST be set to your app id.
+#export APP_ID="your app id"
+#
+## This MUST be set to the directory to put local checkout in.
+#export CHECKOUT_ROOT_DIR='path/to/checkout/root/path'