Add image rename command

This command is a migration tool for making images in the media library compatible with Tachyon.

Addresses #30

composer.json

@@ -15,7 +15,8 @@
 		"humanmade/tachyon-plugin": "~0.11.1",
 		"humanmade/smart-media": "~0.3.0",
 		"humanmade/gaussholder": "1.1.3",
-		"humanmade/aws-rekognition": "~0.1.7"
+		"humanmade/aws-rekognition": "~0.1.7",
+		"humanmade/rename-images-command": "^0.1.0"
 	},
 	"autoload": {
 		"files": [

docs/troubleshooting.md

@@ -0,0 +1,21 @@
+# Troubleshooting
+
+## Some Image URLs Are Broken With Tachyon Enabled
+
+Prior to WordPress 5.3.1 any image files uploaded with a file name like `example-300x300.jpg` were allowed and unmodified. In order to better support automatic modification of image URLs for features like responsive images the dimensions are removed.
+
+In order to work properly and for performance reasons Tachyon requires all images to not have dimensions as their suffix.
+
+Altis provides a migration command to rename legacy images and make the necessary database updates.
+
+```
+wp media rename-images [--network] [--sites-page=<int>] [--search-replace] [--tables=<tables>] [--include-columns=<columns>]
+```
+
+- `--network` if present will run the process for all sites on the network.
+- `--sites-page` allows you to change the current page of sites. 100 sites will be processed at a time so if you have more you will need to run the command again for each page of sites.
+- `--search-replace` if present will perform a database search and replace process for the updated image names.
+- `--tables` defaults to `wp*_posts, wp*_postmeta` and accepts a comma separated list of tables you wish to run the update on. Wildcards are supported.
+- `--include-columns` defaults to `post_content, meta_value` and accepts a comma separated list of database table columns you want to perform the updates on.
+
+Note that this command will take a long time to run when updating the database as well. Additionally the more tables and columns you update the slower this command will be.