Changes

Summary

1. setting autoload (details)
2. Fix: Strings::isPositiveInteger() が 空文字を許可してしまう (details)

Commit 43ea24199fa7a1dd3445d71a1885f103369f025e by pen setting autoload
	composer.json
Commit b31acf2869c0aa0987d2fadc9fcd0fb2a79e383f by pen Fix: Strings::isPositiveInteger() が 空文字を許可してしまう
	unittest/tests/Util/StringsTest.php
	src/Puyo/Util/Strings.php