added some more sample scripts which run - with return types

libraries/stdlib/test/language/main/MainFunctionInt.kt

@@ -0,0 +1,6 @@
+package language.mainint
+
+fun main(args: Array<String>): Int {
+    println("Hello world: Int")
+    return 0
+}

libraries/stdlib/test/language/main/MainFunctionUnit.kt

@@ -0,0 +1,5 @@
+package language.mainunit
+
+fun main(args: Array<String>): Unit {
+    println("Hello world: Unit")
+}