Upgrade dependencies, add a method to check if file exists, update re…

…adme

OmekaAmazonS3StorageAdapterPlugin.php

@@ -0,0 +1,12 @@
+<?php
+
+/**
+ * @copyright 2016 King's College London
+ * @license: https://joinup.ec.europa.eu/community/eupl/og_page/eupl
+ */
+require_once('vendor/autoload.php');
+require_once('libraries/Omeka/Storage/Adapter/AmazonS3.php');
+
+class OmekaAmazonS3StorageAdapterPlugin extends Omeka_Plugin_AbstractPlugin
+{
+}

README.md

@@ -14,9 +14,10 @@ The main differences are:
 
 ## Usage
 
-1. Install the plugin by extracting it to the `plugins` directory in your Omeka instance and enabling
-   in admin/plugins
-2. Add the following to your Omeka `application/configuration/config.ini` file:
+1. Download repo as a zip file and extract it to a folder named `OmekaAmazonS3StorageAdapter` in the `plugins` directory in your Omeka instance.
+2. Run `composer install` within the plugin's folder to install the Amazon S3 PHP SDK.
+3. Enable the plugin in admin/plugins
+4. Add the following to your Omeka `application/configuration/config.ini` file:
 
 ```
 storage.adapter = Omeka_Storage_Adapter_AmazonS3