Improve Japanese docs
Fix a typo
Merge pull request #722 from seratch/patch-1

Improve Japanese docs on Scala Anorm
8. Accessing an SQL database の改善
Fix sidebar for scala database section
rename and update README. refs #724
Merge pull request #725 from playframework-ja/issues_724

rename and update README. refs #724
Fix 。
Merge pull request #723 from seratch/scaladb

8. Accessing an SQL database の改善