Rename plugins to libs and update all file references

libs/stripe-php/lib/Exception/ApiConnectionException.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace Stripe\Exception;
+
+/**
+ * ApiConnection is thrown in the event that the SDK can't connect to Stripe's
+ * servers. That can be for a variety of different reasons from a downed
+ * network to a bad TLS certificate.
+ */
+class ApiConnectionException extends ApiErrorException {}