Minor update and README update

README.md

@@ -87,7 +87,7 @@ A fully operational development environment is provided by [Docker](https://docs
 
 A publicly accessible URL is required if your plugin receives third-party webhooks or responds to events from
 ShipStream via ShipStream's webhooks. For development environments this can be obtained easily and for free with
-[localhost.run](https://localhost.run). 
+[ngrok](https://ngrok.com) or [localhost.run](https://localhost.run). 
 
 ### Windows
 
@@ -158,8 +158,15 @@ You can use a `.env` file in the root of the project to set some configuration o
 ### HTTPS Tunnel
 
 If you need to support callbacks and webhooks from systems not in your local development environment you need your
-url to be publicly accessible. One easy and free way to accomplish this is to use [localhost.run](https://localhost.run)
-which is a simple tunneling service that only requires the common `ssh` command.
+url to be publicly accessible. One easy and free way to accomplish this is to use [ngrok](https://ngrok.com) or [localhost.run](https://localhost.run)
+which are simple tunneling services. The ngrok service uses it's own command line interface and is more robust, while
+localhost.run only requires the common `ssh` command.
+
+```
+$ ngrok http 80
+```
+
+Or:
 
 ```
 $ ssh -R 80:localhost:80 localhost.run
@@ -168,14 +175,21 @@ $ ssh -R 80:localhost:80 localhost.run
 If you changed the `HOST_PORT` in
 your `.env` file you will need to specify the correct port in the ssh command:
 
+```
+$ source .env
+$ ngrok http $HTTP_PORT
+```
+
+Or:
+
 ```
 $ source .env
 $ ssh -R 80:localhost:${HOST_PORT} localhost.run
 ```
 
-Upon a successful connection, you will be given a unique domain name like `user-938444e1.localhost.run`. On the free plan this will
-only last a few hours before it needs to be refreshed with a new domain name. Use this url in the `app/etc/local.xml`
-config file for the `default/middleware/system/base_url` value:
+Upon a successful connection, you will be given a unique domain name like `user-938444e1.localhost.run`. On the free
+plans this will only last a few hours before it needs to be refreshed with a new domain name. Use this url in the
+`app/etc/local.xml` config file for the `default/middleware/system/base_url` value:
 
 ```xml
 <?xml version="1.0"?>
@@ -192,7 +206,8 @@ config file for the `default/middleware/system/base_url` value:
 </config>
 ```
 
-Another honorable mention for an HTTPS via SSH tunneling service is [ngrok](https://ngrok.com/).
+***NOTE:***
+If you update your `base_url`, you may need to also re-register that url for any plugins that make use of callbacks. 
 
 Developer Guide
 ===============

lib/Plugin/Abstract.php

@@ -242,7 +242,7 @@ final public function call($method, $args = array())
      * @param int|string|array|stdClass|null $value
      * @param int|string|null $ifEquals - if specified, the value is only updated if the value was previously equal to $ifEquals value
      * @return mixed
-     * @throws Exception
+     * @throws Plugin_Exception
      */
     final public function setState($data, $value = NULL, $ifEquals = NULL)
     {