Add reset-fork script to testing

TestScripts/reset-fork.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+# Use this script to reset a fork to Wei Dai's master
+# https://stackoverflow.com/questions/9646167/clean-up-a-fork-and-restart-it-from-the-upstream
+
+git remote add upstream https://github.com/weidai11/cryptopp 2>/dev/null
+git fetch upstream
+git checkout master
+git reset --hard upstream/master
+git push origin master --force