BigQuery: Update snippets folder name and remove SELECT * tests (GoogleCloudPlatform#713)

Author: alixhami

bigquery/api/README.md

@@ -20,13 +20,13 @@ All code in the `snippets` directory demonstrate how to invoke Google BigQuery f
 4.  **Install dependencies** via [Composer](http://getcomposer.org/doc/00-intro.md).
     Run `php composer.phar install` (if composer is installed locally) or `composer install`
     (if composer is installed globally).
-5.  Run `php snippets/SNIPPET_NAME.php`. The usage will print for each if no arguments
+5.  Run `php src/SNIPPET_NAME.php`. The usage will print for each if no arguments
     are provided:
     ```sh
-    $ php snippets/create_dataset.php
-    Usage: php snippets/create_dataset.php PROJECT_ID DATASET_ID
+    $ php src/create_dataset.php
+    Usage: php src/create_dataset.php PROJECT_ID DATASET_ID
 
-    $ php snippets/create_dataset.php your-project-id test_dataset_123
+    $ php src/create_dataset.php your-project-id test_dataset_123
     Created dataset test_dataset_123
     ```
 

bigquery/api/snippets/bigquery_client.php bigquery/api/src/bigquery_client.phpbigquery/api/snippets/bigquery_client.php renamed to bigquery/api/src/bigquery_client.php

@@ -31,7 +31,7 @@
  * Usage:
  * ```
  * $projectId = 'Your Project ID';
- * $bigQuery = require 'snippets/bigquery_client.php';
+ * $bigQuery = require 'src/bigquery_client.php';
  * ```
  */
 # [START bigquery_client_default_credentials]