Merge pull request #32 from vincent-gros/master

phase of restructuring
Added <dc:language>he</dc:language>
Update content/30/epub30-test-0130/EPUB/package.opf

move <itemref idref="navtest"/> from:203 to:158
Update content/30/epub30-test-0130/EPUB/xhtml/navtest.xhtml

add Japanese translation, line 18-20
Update content/30/epub30-test-0130/EPUB/xhtml/text-direction-002.xhtml

The Japanese sentence(line:14) was changed according to navtest.xhtml.