Add Google authentication

vendor/OAuth/OAuth2/Service/Exception/InvalidAccessTypeException.php

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+<?php
+
+namespace OAuth\OAuth2\Service\Exception;
+
+use OAuth\Common\Exception\Exception;
+
+/**
+ * Exception thrown when an invalid accessType for the Google Service is specified
+ */
+class InvalidAccessTypeException extends Exception
+{
+}

vendor/OAuth/OAuth2/Service/Exception/InvalidAuthorizationStateException.php

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+<?php
+
+namespace OAuth\OAuth2\Service\Exception;
+
+/**
+ * Exception thrown when the state parameter received during the authorization process is invalid.
+ */
+class InvalidAuthorizationStateException extends \Exception
+{
+}

vendor/OAuth/OAuth2/Service/Exception/InvalidScopeException.php

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+<?php
+
+/**
+ * @author David Desberg <david@daviddesberg.com>
+ * Released under the MIT license.
+ */
+
+namespace OAuth\OAuth2\Service\Exception;
+
+use OAuth\Common\Exception\Exception;
+
+/**
+ * Exception thrown when a scope provided to a service is invalid.
+ */
+class InvalidScopeException extends Exception
+{
+}

vendor/OAuth/OAuth2/Service/Exception/MissingRefreshTokenException.php

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+<?php
+
+/**
+ * @author David Desberg <david@daviddesberg.com>
+ * Released under the MIT license.
+ */
+
+namespace OAuth\OAuth2\Service\Exception;
+
+use OAuth\Common\Exception\Exception;
+
+/**
+ * Exception thrown when service is requested to refresh the access token but no refresh token can be found.
+ */
+class MissingRefreshTokenException extends Exception
+{
+}