Check different 'autoload.php' locations
Use 'Cleaner\Exception' instead of 'RuntimeException'
Made 'Checks' testable
'Collector::getBackupFiles' is no longer called staticaly
'Collector' Object is injected to 'Check::pass' and 'Cleaner::cleanup'
Added 'Check\SizeMin' unit test
Removed 'abstract' keyword
Added 'Check' that validates the backup size against the previous one