create goodbye function and files
Update
Merge pull request #1 from knagase/create_greeting

Pull requset
fixed greeting
Merge pull request #2 from misa-takeba/goodbye_function

Pull Request
Fix goodbye function

modified
-goodbye function path.
-index and layout
fixed greeting
fixed greeting
fixed greeting
Merge pull request #3 from misa-takeba/fix_goodbye_layout

Pull Request, fix goodbye function
fixed greeting
fixed greeting
Merge pull request #4 from knagase/fix_greeting

Pull request
Add configuation files for Heroku