Apple: Fixed example_osx_opengl2, renamed to example_apple_opengl2 + misc comments

README.md

@@ -125,10 +125,9 @@ Languages: (third-party bindings)
 - Swift [swift-imgui](https://github.com/mnmly/Swift-imgui)
 
 Frameworks:
-- Renderers: DirectX 9, DirectX 10, DirectX 11, DirectX 12, OpenGL2, OpenGL3+, Vulkan: [examples/](https://github.com/ocornut/imgui/tree/master/examples)
-- Platform: GLFW, SDL, Win32, Freeglut: [examples/](https://github.com/ocornut/imgui/tree/master/examples)
+- Renderers: DirectX 9, DirectX 10, DirectX 11, DirectX 12, Metal, OpenGL2, OpenGL3+, Vulkan: [examples/](https://github.com/ocornut/imgui/tree/master/examples)
+- Platform: GLFW, SDL, Win32, OSX, Freeglut: [examples/](https://github.com/ocornut/imgui/tree/master/examples)
 - Framework: Allegro 5, Marmalade: [examples/](https://github.com/ocornut/imgui/tree/master/examples)
-- Unmerged Branch: OSX platform without GLFW/SDL: [#1873](https://github.com/ocornut/imgui/tree/osx)
 - Unmerged PR: SDL2 + OpenGLES + Emscripten: [#336](https://github.com/ocornut/imgui/pull/336)
 - Unmerged PR: Native Win32 and OSX: [#281](https://github.com/ocornut/imgui/pull/281)
 - Unmerged PR: Android: [#421](https://github.com/ocornut/imgui/pull/421)
@@ -170,6 +169,7 @@ User screenshots:
 <br>[Gallery Part 4](https://github.com/ocornut/imgui/issues/973) (Jan 2017 to Aug 2017)
 <br>[Gallery Part 5](https://github.com/ocornut/imgui/issues/1269) (Aug 2017 to Feb 2018)
 <br>[Gallery Part 6](https://github.com/ocornut/imgui/issues/1607) (Feb 2018 onward)
+<br>[Gallery Part 6](https://github.com/ocornut/imgui/issues/1902) (June 2018 onward)
 <br>Also see the [Mega screenshots](https://github.com/ocornut/imgui/issues/1273) for an idea of the available features.
 
 Various tools