Unreal Development Kit Beta 2 Repairs and Improvements

* Shader compiler no longer crashes when the log is not writable.
* Game/editor will run without having to first check for existing script files.
* Windows XP: Emissive lights causing purple lighting have been fixed.
* Windows 7: Added new SpeedTree binaries to address OS-specific issue.
* Added check to confirm GPU meets minimum requirements.
* Implemented fix for some SpeedTree trees causing crashes.
* Added fix for invalid characters being allowed in journal files causing database corruption.
* Incorporated fix for making a game in non-English and then running it on another non-English machine.
* Installer

* If a prerequisite fails to install, the install will still continue and warn at the end.
* Enhanced the check for a valid install path.
* If the installer is skipped, the EULA comes up once.
* Fixed CZE install not finding the EULA.
* Fixed problem if temp install folders were deleted between install and uninstall.
* Fixed problem if maps were named in non-ASCII characters.

Details are also available at the Unreal Developer Network (UDN):
https://udn.epicgames.com/Three/DevelopmentKitBuildUpgradeNotes