Resolve TODO: Start $i by looking at all files, otherwise only one generation per hours causes correct order

[SOHELAHMED7]

Unable to figure out properly what this TODO is trying to convey

File: src/lib/generators/MigrationsGenerator.php::generate()

Does it try to convey that do while loop should be replaced by for loop as:

            for ($i = 0; $i < PHP_INT_MAX; $i++) {
                $date = YII_ENV_TEST ? '200000_00' : '';
                $className = $migration->makeClassNameByTime($i, $migrationNamespace, $date);
                if (!file_exists(Yii::getAlias("$migrationPath/$className.php"))) {
                    break;
                }
            }

@cebe any thoughts?

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Part of #10

and

Part of cebe#180