playframework/Play20 — pull request #793 by xuwei-k (2013-03-05 23:13:38+00:00)
Title: fix DB.withTransaction

neither `commit` or `rollback` if use return in `withTransaction`

```scala
withTransaction("default"){
// something codes

return foo; // throw ControlThrowable internally

} // neither commit or rollback
```

https://github.com/scala/scala/blob/v2.10.0/src/library/scala/util/control/NonFatal.scala
https://github.com/scala/scala/blob/v2.10.0/src/library/scala/util/control/ControlThrowable.scala