Added google/appengine-php-sdk dep and updated the README (GoogleCloudPlatform#513)

* Added google/appengine-php-sdk dep and updated the README

* Grammer fix on README

Author: Takashi Matsuo

appengine/wordpress/README.md

@@ -170,6 +170,21 @@ $ vendor/bin/wp plugin update --all --path=wordpress
 $ vendor/bin/wp theme update --all --path=wordpress
 ```
 
+If you're using App Engine Standard, You may get the following error:
+
+```
+Failed opening required 'google/appengine/api/urlfetch_service_pb.php'
+```
+
+You can set a `WP_CLI_PHP_ARGS` environment variable to add
+`include_path` PHP configuration for wp-cli.
+
+```
+$ export WP_CLI_PHP_ARGS='-d include_path=vendor/google/appengine-php-sdk'
+```
+
+Then try the above commands again.
+
 ### Remove plugins/themes
 
 First Deactivate them in the production Dashboard, then remove them

appengine/wordpress/src/files/standard/composer.json

@@ -1,5 +1,6 @@
 {
     "require-dev": {
+        "google/appengine-php-sdk": "^1.9",
         "wp-cli/wp-cli": "~1.1"
     }
 }