refactor/simplify scalaJs plugin and example

- Restructure code as 1 library case class and 1 Build mixin trait. A library is generally easier to understand and could be re-used independently. 1 trait seems simpler than several here.
- Let not the plugin create the multi-project build, but the user project manually. I think while this adds some minor code overhead it is much simpler to understand. Fewer tasks and other moving parts needed.
- Remove verbose nested sbt-style folder structure. It's simpler without it :).

1 files changed, 1 insertions, 1 deletions

diff --git a/stage1/cbt.scala b/stage1/cbt.scala
index 78015b6..8564695 100644
--- a/stage1/cbt.scala
+++ b/stage1/cbt.scala
@@ -16,7 +16,7 @@ object `package`{
   implicit class FileExtensionMethods( file: File ){
     def ++( s: String ): File = {
       if(s endsWith "/") throw new Exception(
-        """Trying to append a String that ends in "/" to a File would loose it. Use .stripSuffix("/") if you need to."""
+        """Trying to append a String that ends in "/" to a File would loose the trailing "/". Use .stripSuffix("/") if you need to."""
       )
       new File( file.toString ++ s )
     }