added: count() method
Standardrizing coding style.
Unnecessary require_once removed.
Fix typos
Remove unnecessary require statement.
No such class ArgumentException.
Update doc comments.
Iterator implements can accept any Traversable value.
冒頭部分英訳

冒頭のUsageまでの部分をREADME.jaを見て英訳
Merge remote-tracking branch 'tanakahisateru/quality2' into devel
Merge remote-tracking branch 'amkt922/devel' into devel
	modified:   README.ja.md