added lib/demo/checkers.lua; setting window caption to "Anaglym"; added ag::clearWorld() and documentation

git-svn-id: svn://anubis/anaglym/trunk@221 99a6e188-d820-4881-8870-2d33a10e2619

lib/demo/checkers.lua

@@ -0,0 +1,15 @@
+
+function createWorld()
+    board = ag.createBoxStatic(8, 8, 0.01)
+    board:setPosition(0, 0, -0.005)
+    board:setTexture(checker)
+    board:setTextureScale(2)
+    ground = ag.createPlane(0, 0, 1, -0.005)
+    ground:setColor(0, 0.4, 0)
+    ag.setCamera(2, -8, 8)
+end
+
+function init_event()
+    checker = ag.loadTexture("checker.jpg")
+    createWorld()
+end