Change package structure
Fix typo
Add validation for message
Change desc from asc to get minutes list
Implement for post memo
Add validation for minutesKeyString
Refactor
Implement for show memo list
Rename index.html to guestbook.html
Implement view
Add link each minutes
Implement for show minutes and post memo
Use uuid as entity keyname
Merge pull request #1 from a-know/chapter-3-2

3.2章「Datastore Service」の写経