convert into ReVIEW format
split introduction.re

source URL and CC license move to notice.re
add CC logo
fix monospace word

add "tt" markup
rename directory re -> review
add Makefile for ReVIEW
update cover image
add published files(epub, pdf)
proofread fonts and typo
Merge pull request #1 from watanabe-masahiro/proofreading

proofread fonts and typo
remove unnecessary spaces
fix key error in ReVIEW
update metadata of the book
update cover image
Merge branch 'review'  of https://github.com/takahashim/scheme_in_ruby