account for eventual consistency in bigquery tests (GoogleCloudPlatform#183)

* account for eventual consistency in bigquery tests

* ensures phpunit 4 is used in google/cloud-tools

Author: bshaffer

bigquery/api/composer.json

@@ -1,8 +1,12 @@
 {
     "require": {
-        "google/cloud": "0.6",
+        "google/cloud": "0.10",
         "symfony/console": "^3.0"
     },
+    "require-dev": {
+        "google/cloud-tools": "<=1.0",
+        "phpunit/phpunit": "~4"
+    },
     "autoload": {
         "psr-4": {
             "Google\\Cloud\\Samples\\BigQuery\\": "src/"