Merge pull request #1 from masaya-myojin/develop

Develop
merge develop
Merge pull request #3 from masaya-myojin/develop

Develop
Merge branch 'master' of github.com:masaya-myojin/denty
set database.yml.default
add database.yml
works gitignore
fix database.yml
fix database.yml for heroku
fix database.yml for heroku
add dashboard page.