I have a SBT project in Intellij 15.0.2 for scala only programming.
For some reason, the project keeps creating the following folders in my project:
You can disable this while creating/importing sbt project (there is a suitable checkbox).
If project is already created, you can go to
Settings |> Build, Execution, Deployment |> Build Tools |> SBT
Create directores for empty content roots automatically
This option is kind of usefull if you are starting a new project as it will create directories for you, but after this I suggest to disable this option and keep only directories you want, otherways directories will be generated each time you build/refresh project.