sbt 0.13.0

no longer need copy `ScriptedPlugin`.
because the `object ScriptedPlugin` is packaged `sbt.ScriptedPlugin` from https://github.com/sbt/sbt/commit/ed4935f3fbfaa0
add scriptedTest for giter8-plugin
Merge branch 'request/sbt0.13' of github.com:xuwei-k/giter8

Conflicts:
	project/build.scala
upgrade to 2.10 compatible version of dispatch classic