Add support for Behat subcontext classes.

        $tokens  = $phpcsFile->getTokens();

        $decName = $phpcsFile->findNext(Tokens::$emptyTokens, ($stackPtr + 1), null, true);

        // Subcontext classes for Behat Drupal Extension are located in

        // *.behat.inc files and should be named ModuleNameSubContext.

        $isSubContext = preg_match('/\.behat$/', $fileName);

        if ($isSubContext === 1) {

            $fileName = preg_replace('/\.behat$/', '', $fileName);

            $fileName = str_replace('_', '', ucwords($fileName, '_')).'SubContext';

        }

        if ($tokens[$decName]['code'] === T_STRING

            && $tokens[$decName]['content'] !== $fileName

        ) {