split methods for test
simplizing code
yaml supports different section number level for PREDEF and POSTDEF
split review-epubmaker's core to library for test unit
copy stylesheet.
support hook and part.
support front/backmatter
refactoring, debug log, colophon.
update test for ePUBMaker.
Merge pull request #207 from kmuto/libepubmaker

merge epubmaker, revised review-epubmaker-ng as next version of review-epubmaker