Add SignInController.

src/main/scala/ScalatraBootstrap.scala

@@ -5,6 +5,7 @@ import javax.servlet._
 class ScalatraBootstrap extends LifeCycle {
   override def init(context: ServletContext) {
     context.mount(new IndexController, "/")
+    context.mount(new SignInController, "/*")
     context.mount(new WikiController, "/*")
     context.mount(new CreateRepositoryController, "/*")
     context.mount(new RepositoryViewerController, "/*")