Move everything under kotlin-native folder

I was forced to manually do update the following files, because otherwise
they would be ignored according .gitignore settings. Probably they
should be deleted from repo.

Interop/.idea/compiler.xml
Interop/.idea/gradle.xml
Interop/.idea/libraries/Gradle__org_jetbrains_kotlin_kotlin_runtime_1_0_3.xml
Interop/.idea/libraries/Gradle__org_jetbrains_kotlin_kotlin_stdlib_1_0_3.xml
Interop/.idea/modules.xml
Interop/.idea/modules/Indexer/Indexer.iml
Interop/.idea/modules/Runtime/Runtime.iml
Interop/.idea/modules/StubGenerator/StubGenerator.iml
backend.native/backend.native.iml
backend.native/bc.frontend/bc.frontend.iml
backend.native/cli.bc/cli.bc.iml
backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2Native.kt
backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2NativeCompilerArguments.kt
backend.native/tests/link/lib/foo.kt
backend.native/tests/link/lib/foo2.kt
backend.native/tests/teamcity-test.property

kotlin-native/samples/coverage/src/coverageMain/kotlin/bar.kt

@@ -0,0 +1,17 @@
+fun baz(args: Array<String>) {
+    if (args.size > 4) {
+        println("Too many")
+    } else {
+        println("Fine")
+    }
+}
+
+class A {
+    init {
+        println("A::init")
+    }
+
+    fun f() {
+        println("A::f")
+    }
+}

kotlin-native/samples/coverage/src/coverageMain/kotlin/main.kt

@@ -0,0 +1,3 @@
+fun main() {
+    baz(arrayOf("abc"))
+}

kotlin-native/samples/coverage/src/coverageTest/kotlin/Tests.kt

@@ -0,0 +1,15 @@
+import kotlin.test.Test
+import kotlin.test.assertTrue
+
+class CoverageTests {
+    @Test
+    fun testHello() {
+        main()
+    }
+
+    @Test
+    fun testA() {
+        val a = A()
+        a.f()
+    }
+}