playframework/Play20 — pull request #449 by jto (2012-09-11 10:19:31+00:00)
Title: Fix play versions conflict when using play plugins

Add a new setting to PlayProject called playPlugin

```scala
lazy val plugin = PlayProject(appName, appVersion, pluginDependencies, mainLang = SCALA).settings(
playPlugin := true,
)
```

When set to true, dependency on Play is marked as provided, which avoid conflicts between Play from your app, and Play from a plugin.