add test which is checking answer after user input
Merge branch 'develop' of github.com:leehosung/writing_sandbox into develop
Merge branch 'develop' of github.com:leehosung/writing_sandbox into develop
split original homee_page to home_page and learn_page
home_page shows sets. and we can learn something in learn page
Merge pull request #10 from leehosung/develop

Develop to master merging. unittest is passed. yaho!