add a Gemfile to generate documents
add rake task to generate documents
Revert "add rake task to generate documents"

This reverts commit 3180b091ae0ce68d33e642bec864ef77ffb4da3e.
correct a erroneous conversion
Merge pull request #3 from toshiwo/correct_erroneous_conversion

correct a erroneous conversion
Merge branch 'refs/heads/japanese' into gh-pages
generate the HTML document