refactor: mkdir_p also do directory-checking, so no need to FileTest.directory?
refactor: mkdir_p also do directory-checking, so no need to FileTest.directory?

cf: http://www.clear-code.com/blog/2012/5/21.html

kmuto/review,orangain/review,kuad9/review_study,kmuto/review,krororo/review,takahashim/review,krororo/review,takahashim/review,masawada/review,orangain/review,murashitas/review,masawada/review,suzuki/review,murashitas/review,kuad9/review_study,krororo/review,kmuto/review,suzuki/review