Upgrade branch 2.6.x using TemplateControl

[gmethvin]

Updated with template-control on 2017-06-03T15:58:23.726Z
  **/plugins.sbt:
    addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.6.0-RC1")

[marcospereira]

This needs to be update manually too:

[error] /home/travis/build/playframework/play-java-dagger2-example/app/dagger/MyComponentsFromContext.java:28: dagger.MyComponentsFromContext is not abstract and does not override abstract method executionContext() in play.libs.ws.ahc.AhcWSComponents
[error] public class MyComponentsFromContext extends BuiltInComponentsFromContext
[error] /home/travis/build/playframework/play-java-dagger2-example/app/dagger/MyComponentsFromContext.java:39: method does not override or implement a method from a supertype
[error]     @Override
[error] /home/travis/build/playframework/play-java-dagger2-example/app/dagger/MyComponentsFromContext.java:42: cannot find symbol
[error]   symbol: method injector()
[error]         Injector injector = super.injector();
[error] /home/travis/build/playframework/play-java-dagger2-example/app/dagger/MyComponentsFromContext.java:48: invalid method reference
[error]   cannot find symbol
[error]     symbol:   method defaultParser()
[error]     location: class dagger.MyComponentsFromContext
[error]         extraMappings.put(play.mvc.BodyParser.Default.class, this::defaultParser);

I'm closing this PR and will submit another one later.