Executable BioRuby documents

https://docs.google.com/presentation/d/1mKKzD8erZc5Qbrbr1CDck76PGy8ZJecshmsqkRPMmUc/edit?usp=sharing

• We created a CI workflow for BioRuby documentation.
• This workflow is automated and the Ruby code result is reproducible.

First we update the documents in github This update is sent to TravisCI Travis runs rubydown for the documents

• https://github.com/sciruby-jp/rubydown
• https://github.com/bioruby/documents