Add raylib lua examples

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diff --git a/examples/shaders_custom_uniform.lua b/examples/shaders_custom_uniform.lua
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+-------------------------------------------------------------------------------------------
+--
+--  raylib [shaders] example - Apply a postprocessing shader and connect a custom uniform variable
+--
+--  NOTE: This example requires raylib OpenGL 3.3 or ES2 versions for shaders support,
+--        OpenGL 1.1 does not support shaders, recompile raylib to OpenGL 3.3 version.
+--
+--  NOTE: Shaders used in this example are #version 330 (OpenGL 3.3), to test this example
+--        on OpenGL ES 2.0 platforms (Android, Raspberry Pi, HTML5), use #version 100 shaders
+--        raylib comes with shaders ready for both versions, check raylib/shaders install folder
+--
+--  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
+
+SetConfigFlags(FLAG.MSAA_4X_HINT)      -- Enable Multi Sampling Anti Aliasing 4x (if available)
+
+InitWindow(screenWidth, screenHeight, "raylib [shaders] example - custom uniform variable")
+
+-- 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 (diffuse map)
+dwarf.material.texDiffuse = texture                                    -- Set dwarf model diffuse texture
+
+local position = Vector3(0.0, 0.0, 0.0)                                -- Set model position
+
+local shader = LoadShader("resources/shaders/glsl330/base.vs", 
+                          "resources/shaders/glsl330/swirl.fs")        -- Load postpro shader
+
+-- Get variable (uniform) location on the shader to connect with the program
+-- NOTE: If uniform variable could not be found in the shader, function returns -1
+local swirlCenterLoc = GetShaderLocation(shader, "center")
+
+local swirlCenter = { screenWidth/2, screenHeight/2 }
+
+-- Create a RenderTexture2D to be used for render to texture
+local target = LoadRenderTexture(screenWidth, screenHeight)
+
+-- Setup orbital camera
+SetCameraMode(CAMERA.ORBITAL)          -- Set an orbital camera mode
+SetCameraPosition(camera.position)     -- Set internal camera position to match our camera position
+SetCameraTarget(camera.target)         -- Set internal camera target to match our camera target
+
+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
+    ---------------------------------------------------------------------------------------
+    local mousePosition = GetMousePosition()
+
+    swirlCenter[0] = mousePosition.x
+    swirlCenter[1] = screenHeight - mousePosition.y
+
+    -- Send new value to the shader to be used on drawing
+    SetShaderValue(shader, swirlCenterLoc, swirlCenter, 2)
+    
+    UpdateCamera(&camera)              -- Update internal camera and our camera
+    ---------------------------------------------------------------------------------------
+
+    -- Draw
+    ---------------------------------------------------------------------------------------
+    BeginDrawing()
+
+        ClearBackground(RAYWHITE)
+        
+        BeginTextureMode(target)       -- Enable drawing to texture
+
+            Begin3dMode(camera)
+
+                DrawModel(dwarf, position, 2.0, WHITE)   -- Draw 3d model with texture
+
+                DrawGrid(10, 1.0)     -- Draw a grid
+
+            End3dMode()
+            
+            DrawText("TEXT DRAWN IN RENDER TEXTURE", 200, 10, 30, RED)
+        
+        EndTextureMode()           -- End drawing to texture (now we have a texture available for next passes)
+        
+        BeginShaderMode(shader)
+        
+            -- NOTE: Render texture must be y-flipped due to default OpenGL coordinates (left-bottom)
+            DrawTextureRec(target.texture, Rectangle(0, 0, target.texture.width, -target.texture.height), Vector2(0, 0), WHITE)
+        
+        EndShaderMode()
+        
+        DrawText("(c) Dwarf 3D model by David Moreno", screenWidth - 200, screenHeight - 20, 10, GRAY)
+
+        DrawFPS(10, 10)
+
+    EndDrawing()
+    ---------------------------------------------------------------------------------------
+end
+
+-- De-Initialization
+-------------------------------------------------------------------------------------------
+UnloadShader(shader)           -- Unload shader
+UnloadTexture(texture)         -- Unload texture
+UnloadModel(dwarf)             -- Unload model
+UnloadRenderTexture(target)    -- Unload render texture
+
+CloseWindow()                  -- Close window and OpenGL context
+-------------------------------------------------------------------------------------------
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