Adds adapter for Google Cloud Client Library

.gitignore

@@ -6,3 +6,5 @@ tests/adapters/*
 bin/*
 !bin/configure_test_env.sh
 doc/.couscous
+nbproject/*
+tests/Gaufrette/Functional/adapters/*.php

composer.json

@@ -38,7 +38,8 @@
         "phpunit/phpunit": "3.7.*",
         "microsoft/windowsazure": "dev-master",
         "mikey179/vfsStream": "~1.2.0",
-        "league/flysystem": "~1.0"
+        "league/flysystem": "~1.0",
+        "google/cloud": ">=0.20.1"
     },
     "suggest": {
         "knplabs/knp-gaufrette-bundle": "to use with Symfony2",

doc/adapters/google-cloud-client-storage.md

@@ -0,0 +1,52 @@
+---
+currentMenu: google-cloud-client-storage
+---
+
+# Google Cloud Client Storage
+
+This adapter requires an instance of Google\Cloud\Storage\StorageClient that has proper access rights to the bucket you want to use.
+
+For more details see:
+http://googlecloudplatform.github.io/google-cloud-php/
+https://console.cloud.google.com/
+
+## Example
+
+```php
+<?php
+
+use Gaufrette\Filesystem;
+use Gaufrette\Adapter\GoogleCloudClientStorage;
+
+$storage = new StorageClient(array(
+    'projectId'     => 'your-project-id',
+    'keyFilePath'   => 'path/to/your/project/key.json'
+));
+
+# you can optionally set the directory in the bucket and the acl permissions for all uploaded files...
+# by default the uploaded files are read/write by the owner only
+# the example below gives read access to the uploaded files to anyone in the world
+
+$adapter = new GoogleCloudClientStorage($storage, 'bucket_name',
+    array(
+        'directory' => 'bucket_directory',
+        'acl'       => array(
+            'allUsers' => \Google\Cloud\Storage\Acl::ROLE_READER
+        )
+    )
+);
+
+$key = 'myAmazingFile.txt';
+
+# optional
+$adapter->setMetadata($key,
+    array(
+        'FileDescription' => 'This is my file. There are many like it, but this one is mine.'
+    )
+);
+
+$filesystem = new Filesystem($adapter);
+
+$filesystem->write($key, 'Uploaded at: '.date('Y-m-d @ H:i:s'), true);
+
+```