Added support for module registration using HttpApplication.RegisterModule in .net 4.5

Fix for issue #45 (https://github.com/castleproject/Windsor/issues/45)
Update PerWebRequestLifestyleModuleRegistration.cs

Updated spacing to make sure tabs are used.
Merge pull request #48 from BredStik/master

Fix for issue #45: Added support HttpApplication.RegisterModule in .net 4.5