Generate from giter8 as part of CI process

[rossabaker]

This needs to be rebuilt and committed from the scalatra-sbt.g8 project. There should be no direct checkins here. There is no reason to maintain two template projects.

[jlarmstrong]

g8 now runs on SBT 11, this project should be updated at well

[xuwei-k]

https://github.com/scalatra/scalatra-sbt.g8

[takezoe]

We maintain https://github.com/scalatra/scalatra.g8 and documents indicate to use it as well, so this repository is not necessary any more. Can we delete this repository?