Merge pull request #24 from htakahashi/hiro

Added interaction to some pages.
09 and 10
Merge branch 'refs/heads/master' into josh
Merge pull request #25 from htakahashi/josh

Josh
new button
Merge branch 'refs/heads/master' into josh
Merge pull request #26 from htakahashi/josh

Josh
added in page nav for unexpected slides.