Play 2.4 support

[0x1997]

I haven't updated the play-sample project because I'm not sure about the relative loading order of injected modules and old-style plugins. Anyway, It can be updated to use https://github.com/flyway/flyway-play when that is published.

[xuwei-k]

https://travis-ci.org/scalikejdbc/scalikejdbc-async/jobs/50314414#L1742

sbt.ResolveException: unresolved dependency: org.scalaz.stream#scalaz-stream_2.11;0.5a: not found
    at sbt.IvyActions$.sbt$IvyActions$$resolve(IvyActions.scala:278)
    at sbt.IvyActions$$anonfun$updateEither$1.apply(IvyActions.scala:175)
    at sbt.IvyActions$$anonfun$updateEither$1.apply(IvyActions.scala:157)
    at sbt.IvySbt$Module$$anonfun$withModule$1.apply(Ivy.scala:151)

[coveralls]

Coverage increased (+13.91%) to 92.86% when pulling 7b2789f on 0x1997:play-2.4 into 0760d1b on scalikejdbc:develop.

[seratch]

Thanks. I'd like to merge this PR after play-sample updates. If flyway-play will be a blocker for long time, I'll rethink.

[tototoshi]

Sorry to have kept you waiting. A snapshot version of flyway-play is now available.

resolvers +=
  "Sonatype OSS Snapshots" at "https://oss.sonatype.org/content/repositories/snapshots"

libraryDependencies ++= Seq(
  "org.flywaydb" %% "flyway-play" % "2.0.0-SNAPSHOT"
)

[seratch]

play 2.4 will be out soon. https://groups.google.com/forum/#!topic/play-framework-dev/HJncEA0svak
@0x1997 Are you still interested in working on this pull request?

[0x1997]

@seratch Sorry for the hiatus. Play didn't work out in that project of mine and I don't have time to finished this at the moment. Please feel free to take my code if it still works.

[Tolsi]

It is unclear whether the module is supported Play 2.4+ and that prevents this? If supported, I'd like an example.

[seratch]

@Tolsi No, still unsupported. Since scalikejdbc-async's connection pool is simple, it should be easy to write your own Play integration.

[xuwei-k]

Sorry, We have deleted playframework support. #56