first heroku try

build.sbt

 import org.scalatra.sbt._
 import org.scalatra.sbt.PluginKeys._
 import ScalateKeys._
+import com.typesafe.sbt.packager.archetypes.JavaAppPackaging
 
 val ScalatraVersion = "2.5.0"
 
@@ -24,7 +25,7 @@ libraryDependencies ++= Seq(
   "org.scalatra" %% "scalatra-scalate" % ScalatraVersion,
   "org.scalatra" %% "scalatra-specs2" % ScalatraVersion % "test",
   "ch.qos.logback" % "logback-classic" % "1.1.5" % "runtime",
-  "org.eclipse.jetty" % "jetty-webapp" % "9.2.15.v20160210" % "container",
+  "org.eclipse.jetty" % "jetty-webapp" % "9.2.15.v20160210" % "compile;container",
   "javax.servlet" % "javax.servlet-api" % "3.1.0" % "provided",
   "org.scalanlp" %% "breeze" % "0.13.1"
 )
@@ -49,4 +50,5 @@ scalateTemplateConfig in Compile := {
 }
 
 
-enablePlugins(JettyPlugin)
+enablePlugins(JettyPlugin, JavaAppPackaging)
+

project/plugins.sbt

 addSbtPlugin("org.scalatra.scalate" % "sbt-scalate-precompiler" % "1.8.0.1")
 
 addSbtPlugin("org.scalatra.sbt" % "scalatra-sbt" % "0.5.1")
+
+addSbtPlugin("com.typesafe.sbt"    % "sbt-native-packager"    % "1.0.6")