Revert changes made to crossbuild scalahost

Scalahost was being crossbuilt to enable us to integrate it in SBT,
but it seems too complicated.
Modify attachments to be a Map(String -> Any)

This way we can easily extract attachments from anywhere by casting
the values of this Map.
Merge pull request #10 from Duhemm/master

Revert changes made to split and cross build, change attachment to Map[String, Any]