Fix Play2 friendly tasks #213

skinny-task for Play Framework users.

### build.sbt

```scala
lazy val task = (project in file("task")).settings(
  scalaSource in Compile := baseDirectory.value,
  libraryDependencies ++= Seq(
    "org.skinny-framework" %% "skinny-task" % skinnyVersion,
    "org.skinny-framework" %% "skinny-orm"  % skinnyVersion,
    "com.h2database"       %  "h2"          % "1.4.183"
  ),
  mainClass := Some("TaskRunnner")
)
```

### task/TaskRunner.scala

```scala
import skinny.task._, generator._
object TaskRunner extends SkinnyTaskLauncher {
  register("model", (params) => PlayModelGenerator.run(params))
  register("reverse-model", (params) => PlayReverseModelGenerator.run(params))
  register("reverse-model-all", (params) => PlayReverseModelAllGenerator.run(params))
}
```