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 :).

11 files changed, 17 insertions, 26 deletions

diff --git a/examples/build-scalajs/build/build/build.scala b/examples/build-scalajs/build/build/build.scala
deleted file mode 100644
index 19593f9..0000000
--- a/examples/build-scalajs/build/build/build.scala
+++ /dev/null
@@ -1,7 +0,0 @@
-import cbt._
-class Build(val context: Context) extends BuildBuild{
-
-  override def dependencies =
-    super.dependencies :+
-      DirectoryDependency(new File(context.cbtHome + "/plugins/scalajs"))
-}
diff --git a/examples/build-scalajs/README.md b/examples/scalajs-react-example/README.md
index 74e015a..74e015a 100644
--- a/examples/build-scalajs/README.md
+++ b/examples/scalajs-react-example/README.md
diff --git a/examples/build-scalajs/js/src/main/scala/App.scala b/examples/scalajs-react-example/js/App.scala
index 2682936..0cd170e 100644
--- a/examples/build-scalajs/js/src/main/scala/App.scala
+++ b/examples/scalajs-react-example/js/App.scala
@@ -3,19 +3,12 @@ package prototype
 import japgolly.scalajs.react.ReactDOM
 import org.scalajs.dom
 
-import scala.scalajs.js
 import scala.scalajs.js.JSApp
 import scala.scalajs.js.annotation.JSExport
-import scalajs.js.Dynamic.{global => g}
 
-/**
- * Created by katrin on 2016-04-10.
- */
 @JSExport("App")
 object App extends JSApp {
-
   def main(): Unit = {
-
     val doc = dom.document
     ReactDOM.render(Pictures.PictureComponent(), doc.getElementById("main"))
   }
diff --git a/examples/build-scalajs/js/src/main/scala/Pictures.scala b/examples/scalajs-react-example/js/Pictures.scala
index 88329ee..db1d7ef 100644
--- a/examples/build-scalajs/js/src/main/scala/Pictures.scala
+++ b/examples/scalajs-react-example/js/Pictures.scala
@@ -8,9 +8,6 @@ import japgolly.scalajs.react.vdom.all._
 
 import scala.scalajs.js.JSON
 
-/**
- * Created by katrin on 2016-04-10.
- */
 object Pictures {
 
   case class State(pictures: List[Picture], favourites: List[Picture])
diff --git a/examples/build-scalajs/build/build.scala b/examples/scalajs-react-example/js/build/build.scala
index 89ad030..29f1c73 100644
--- a/examples/build-scalajs/build/build.scala
+++ b/examples/scalajs-react-example/js/build/build.scala
@@ -1,9 +1,11 @@
 import cbt._
-import java.io.File
-class Build( val context: Context ) extends ScalaJsBuild {
-
+class Build(val context: Context) extends ScalaJsBuild{
   override val projectName = "my-project"
 
+  override def sources = super.sources ++ Seq(
+    projectDirectory.getParentFile ++ "/shared"
+  )
+
   override def dependencies = (
     super.dependencies ++
       Resolver( mavenCentral ).bind(
@@ -14,11 +16,7 @@ class Build( val context: Context ) extends ScalaJsBuild {
       )
   )
 
-  /* ++ some JVM only dependencies */
-  override def jvmDependencies = Seq.empty
-
-  override def fastOptOutput = {
-    projectDirectory.getAbsolutePath + "/server/public/" + new File(super.fastOptOutput).getName
+  override protected def fastOptJSFile = {
+    projectDirectory.getParentFile ++ "/server/public" ++ ("/"++super.fastOptJSFile.getName)
   }
 }
-
diff --git a/examples/scalajs-react-example/js/build/build/build.scala b/examples/scalajs-react-example/js/build/build/build.scala
new file mode 100644
index 0000000..b30e005
--- /dev/null
+++ b/examples/scalajs-react-example/js/build/build/build.scala
@@ -0,0 +1,4 @@
+import cbt._
+class Build(val context: Context) extends BuildBuild{
+  override def dependencies = super.dependencies :+ plugins.scalaJs
+}
diff --git a/examples/scalajs-react-example/jvm/build/build.scala b/examples/scalajs-react-example/jvm/build/build.scala
new file mode 100644
index 0000000..327d705
--- /dev/null
+++ b/examples/scalajs-react-example/jvm/build/build.scala
@@ -0,0 +1,6 @@
+import cbt._
+class Build(val context: Context) extends BaseBuild{
+  override def sources = super.sources ++ Seq(
+    projectDirectory.getParentFile ++ "/shared"
+  )
+}
diff --git a/examples/build-scalajs/server/app.js b/examples/scalajs-react-example/server/app.js
index 620c26a..620c26a 100644
--- a/examples/build-scalajs/server/app.js
+++ b/examples/scalajs-react-example/server/app.js
diff --git a/examples/build-scalajs/server/package.json b/examples/scalajs-react-example/server/package.json
index d20ec98..d20ec98 100644
--- a/examples/build-scalajs/server/package.json
+++ b/examples/scalajs-react-example/server/package.json
diff --git a/examples/build-scalajs/server/public/index.html b/examples/scalajs-react-example/server/public/index.html
index 08de20d..08de20d 100644
--- a/examples/build-scalajs/server/public/index.html
+++ b/examples/scalajs-react-example/server/public/index.html
diff --git a/examples/build-scalajs/shared/src/main/scala/prototype/Picture.scala b/examples/scalajs-react-example/shared/Picture.scala
index dbb985a..dbb985a 100644
--- a/examples/build-scalajs/shared/src/main/scala/prototype/Picture.scala
+++ b/examples/scalajs-react-example/shared/Picture.scala