Add raylib lua examples

examples/models_obj_loading.lua

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+-------------------------------------------------------------------------------------------
+--
+--  raylib [models] example - Load and draw a 3d model (OBJ)
+--
+--  This example has been created using raylib 1.6 (www.raylib.com)
+--  raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+--
+--  Copyright (c) 2014-2016 Ramon Santamaria (@raysan5)
+--
+-------------------------------------------------------------------------------------------
+
+-- Initialization
+-------------------------------------------------------------------------------------------
+local screenWidth = 800
+local screenHeight = 450
+
+InitWindow(screenWidth, screenHeight, "raylib [models] example - obj model loading")
+
+-- Define the camera to look into our 3d world
+local camera = Camera(Vector3(3.0, 3.0, 3.0), Vector3(0.0, 1.5, 0.0), Vector3(0.0, 1.0, 0.0), 45.0)
+
+local dwarf = LoadModel("resources/model/dwarf.obj")                -- Load OBJ model
+local texture = LoadTexture("resources/model/dwarf_diffuse.png")    -- Load model texture
+dwarf.material.texDiffuse = texture                                 -- Set dwarf model diffuse texture
+local position = Vector3(0.0, 0.0, 0.0)                             -- Set model position
+
+SetTargetFPS(60)        -- Set our game to run at 60 frames-per-second
+-------------------------------------------------------------------------------------------
+
+-- Main game loop
+while not WindowShouldClose() do            -- Detect window close button or ESC key
+    -- Update
+    ---------------------------------------------------------------------------------------
+    -- ...
+    ---------------------------------------------------------------------------------------
+
+    -- Draw
+    ---------------------------------------------------------------------------------------
+    BeginDrawing()
+
+        ClearBackground(RAYWHITE)
+
+        Begin3dMode(camera)
+
+            DrawModel(dwarf, position, 2.0f, WHITE)   -- Draw 3d model with texture
+
+            DrawGrid(10, 1.0f)         -- Draw a grid
+
+            DrawGizmo(position)        -- Draw gizmo
+
+        End3dMode()
+        
+        DrawText("(c) Dwarf 3D model by David Moreno", screenWidth - 200, screenHeight - 20, 10, GRAY)
+
+        DrawFPS(10, 10)
+
+    EndDrawing()
+    ---------------------------------------------------------------------------------------
+end
+
+-- De-Initialization
+-------------------------------------------------------------------------------------------
+UnloadTexture(texture)     -- Unload texture
+UnloadModel(dwarf)         -- Unload model
+
+CloseWindow()              -- Close window and OpenGL context
+-------------------------------------------------------------------------------------------