Renamed data -> testData in integration-tests.

compiler/integration-tests/testData/compileAndRunHelloApp/hello.compile.expected

@@ -0,0 +1 @@
+Return code: 0

compiler/integration-tests/testData/compileAndRunHelloApp/hello.kt

@@ -0,0 +1,5 @@
+package Hello
+
+fun main(args : Array<String>) {
+    System.out.println("Hello!")
+}

compiler/integration-tests/testData/compileAndRunHelloApp/hello.run.expected

@@ -0,0 +1,2 @@
+OUT Hello!
+Return code: 0