fix examples & cache tests

Author: bshaffer

examples/idtoken.php

@@ -24,8 +24,7 @@
  * Ensure you've downloaded your oauth credentials
  ************************************************/
 if (!$oauth_credentials = getOAuthCredentialsFile()) {
-  echo missingOAuth2CredentialsWarning();
-  exit;
+  return missingOAuth2CredentialsWarning();
 }
 
 /************************************************

examples/large-file-upload.php

@@ -24,8 +24,7 @@
  * Ensure you've downloaded your oauth credentials
  ************************************************/
 if (!$oauth_credentials = getOAuthCredentialsFile()) {
-  echo missingOAuth2CredentialsWarning();
-  exit;
+  return missingOAuth2CredentialsWarning();
 }
 
 /************************************************

examples/multi-api.php

@@ -25,8 +25,7 @@
  * Ensure you've downloaded your oauth credentials
  ************************************************/
 if (!$oauth_credentials = getOAuthCredentialsFile()) {
-  echo missingOAuth2CredentialsWarning();
-  exit;
+  return missingOAuth2CredentialsWarning();
 }
 
 /************************************************

examples/simple-file-upload.php

@@ -24,8 +24,7 @@
  * Ensure you've downloaded your oauth credentials
  ************************************************/
 if (!$oauth_credentials = getOAuthCredentialsFile()) {
-  echo missingOAuth2CredentialsWarning();
-  exit;
+  return missingOAuth2CredentialsWarning();
 }
 
 /************************************************

examples/url-shortener.php

@@ -24,8 +24,7 @@
  * Ensure you've downloaded your oauth credentials
  ************************************************/
 if (!$oauth_credentials = getOAuthCredentialsFile()) {
-  echo missingOAuth2CredentialsWarning();
-  exit;
+  return missingOAuth2CredentialsWarning();
 }
 
 /************************************************

src/Google/Cache/File.php

@@ -73,7 +73,7 @@ public function get($key, $expiration = false)
     if ($this->acquireReadLock($storageFile)) {
       if (filesize($storageFile) > 0) {
         $data = fread($this->fh, filesize($storageFile));
-        unserialize($data);
+        $data = unserialize($data);
       } else {
         $this->log(
             'debug',