update sbt-native-packager 0.7.2-RC1

refactoring build files
http://stackoverflow.com/a/24103453/605582
So this is an sbt plugin for the sbt plugins build for the Play sbt plugin project?

    java.lang.MetaOverflowError

Ok.  @eed3si9n is it going to be ok to depend on this from a dbuild perspective?  Or from a Play depending on milestone builds of sbt in future?