kmuto/review — pull request #290 by takahashim (2014-06-18 04:02:25+00:00)
Title: remove ReVIEW.book

``ReVIEW.book`` is used as global variable.
In *builder, ``@book`` is better than ``ReVIEW.book``.
(``ReVIEW.book`` should be used in initialization and tests)