Merge pull request #1 from TatsuoWatanabe/master

pull request for merge.
Merge pull request #2 from TatsuoWatanabe/master

pull request for merge.
Merge pull request #3 from TatsuoWatanabe/master

commit
Merge pull request #4 from TatsuoWatanabe/master

pull request for merge.
Merge pull request #5 from TatsuoWatanabe/gh-pages

pull request for merge.