bump scalatra version

Author: mkrogemann

samples/scala-scalatra/project/build.scala

@@ -8,7 +8,7 @@ object PetstoreBuild extends Build {
   val Name = "Petstore"
   val Version = "1.0.0"
   val ScalaVersion = "2.10.3"
-  val ScalatraVersion = "2.2.0"
+  val ScalatraVersion = "2.2.2"
 
   lazy val project = Project (
     "petstore",