updated documentation and made Irrliht.NET compile again

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@715 dfc29bdd-3216-0410-991c-e03cc46cb475

changes.txt

-Changes in version 1.3.1 (?? Mar 2007)
+Changes in version 1.3.1 (20 Jun 2007)
 
  - Fixed a bug with negative exponents in fast_atof, posted by RVL
 

readme.txt

 ==========================================================================
-The Irrlicht Engine SDK version 1.3
+The Irrlicht Engine SDK version 1.3.1 
 ==========================================================================
 
   Welcome the Irrlicht Engine SDK.

source/Irrlicht.NET/Irrlicht.NET.cpp

@@ -63,7 +63,7 @@ IrrlichtDevice::IrrlichtDevice(Video::DriverType driverType, Core::Dimension2D w
 	p.Fullscreen = fullScreen;
 	p.Stencilbuffer = stencilBuffer;
 	p.Vsync = vsync;
-	p.WindowId = reinterpret_cast<irr::s32>((void*)windowHandle);
+	p.WindowId = (void*)windowHandle;
 	p.WindowSize = irr::NativeConverter::getNativeDim(windowSize);
 
 	Device = irr::createDeviceEx(p);