fix loading builder_init on review-ext.rb
fix loading builder_init on review-ext.rb

ReVIEW::Compiler.new should be executed _after_ ReVIEW::Book::Base.load_default or ReVIEW::Book::Base.load
(cf. #362)

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