1st test for traits work

idea/testData/codegen/traits/simple.jet

@@ -0,0 +1,12 @@
+trait SimpleClass : java.lang.Object {
+    fun foo() : String = "239 " + toString ()
+}
+
+class SimpleClassImpl() : SimpleClass {
+   override fun toString() = "SimpleClassImpl"
+}
+
+fun box() : String {
+  val c = SimpleClassImpl()
+  return if("239 SimpleClassImpl" == c.foo()) "OK" else "fail"
+}

idea/tests/org/jetbrains/jet/codegen/TraitsTest.java

@@ -0,0 +1,13 @@
+package org.jetbrains.jet.codegen;
+
+public class TraitsTest  extends CodegenTestCase {
+    @Override
+    protected String getPrefix() {
+        return "traits";
+    }
+
+    public void testSimple () throws Exception {
+        blackBoxFile("traits/simple.jet");
+        System.out.println(generateToText());
+    }
+}