Fix the server response.

src/main/kotlin/com/beust/kobalt/app/remote/SparkServer.kt

@@ -4,6 +4,7 @@ import com.beust.kobalt.Args
 import com.beust.kobalt.api.Kobalt
 import com.beust.kobalt.api.Project
 import com.google.gson.Gson
+import spark.ResponseTransformer
 import spark.Route
 import spark.Spark
 
@@ -20,30 +21,36 @@ class SparkServer(val initCallback: (String) -> List<Project>, val cleanUpCallba
         SparkServer.cleanUpCallback = cleanUpCallback
     }
 
+    class JsonTransformer : ResponseTransformer {
+        val gson = Gson()
+        override fun render(model: Any) = gson.toJson(model)
+    }
+
     override fun run(port: Int) {
         Spark.port(port)
-        Spark.get("/hello", Route { req, res -> "Hello world" })
+        Spark.get("/hello", { req, res -> "Hello world" })
-        Spark.get("/v0/getDependencies", { request, response ->
+        Spark.get("/v0/getDependencies", "application/json", Route { request, response ->
             val buildFile = request.queryParams("buildFile")
+            initCallback(buildFile)
+            val result =
                 if (buildFile != null) {
-                val projects = initCallback(buildFile)
+                    initCallback(buildFile)
-                val result = try {
+                    try {
                         val dependencyData = Kobalt.INJECTOR.getInstance(DependencyData::class.java)
                         val args = Kobalt.INJECTOR.getInstance(Args::class.java)
 
-                    val dd = dependencyData.dependenciesDataFor(buildFile, args)
+                        dependencyData.dependenciesDataFor(buildFile, args)
-                    Gson().toJson(dd)
                     } catch(ex: Exception) {
                         "Error: " + ex.message
                     } finally {
                         cleanUpCallback()
                     }
-
-                result
                 } else {
                     "error"
                 }
-        })
+            cleanUpCallback()
+            result
+        }, JsonTransformer())
     }
 }