deprecated: method selectManyWith
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added: memoize() method
	new file:   README.ja.md
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	modified:   README.ja.md
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added: Ginq::each()
modified: IterProvider methods return type
	modified:   src/Ginq/Iterator/EachIterator.php
fixed: #13
#14 fixed
implemented orderBy*, thenBy, fixed #12
updated: header comment