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/gtk/README.md

@@ -0,0 +1,39 @@
+# GTK application
+
+This example shows how one may use _Kotlin/Native_ to build GUI
+applications with the GTK toolkit.
+
+To build use `../gradlew assemble`.
+
+Do not forget to install GTK3. See bellow.
+
+To run on Mac also install XQuartz X server (https://www.xquartz.org/), and then `../gradlew runReleaseExecutableGtk` or execute the program directly:
+
+    ./build/bin/gtk/main/release/executable/gtk.kexe
+
+Dialog box with the button will be shown, and application will print message
+and terminate on button click.
+
+
+#### GTK3 Install
+
+on Mac use
+
+    brew install gtk+3
+
+or
+
+    port install gtk3
+
+on Debian flavours of Linux
+
+    sudo apt-get install libgtk-3-dev
+
+on Fedora
+
+    sudo dnf install gtk3-devel
+
+on Windows in MinGW64 console, if you do
+not have MSYS2-MinGW64 installed - install it first as described in http://www.msys2.org
+
+    pacman -S mingw-w64-x86_64-gtk3