fix many issues

- giter8 plugin delete
 - because `"net.databinder" %% "giter8-plugin" % "0.4.4"` is not exists in any repository
 - and `giter8-plugin` for sbt 0.12.x is not exists

- delete `com.typesafe.util.Sbt.logger`
 - compile fail
 - `com.typesafe.util.Sbt.logger` for play2.1-RC2 is [not exists](https://github.com/typesafehub/play-plugins/blob/4c39913573eb3affb65e46096865dae0805fd896/sbtlogger/build.sbt#L13)

- fix documents sbt 0.11.x => sbt 0.12.x

- fix sbt documents url http://scala-sbt.org instead of github wiki