Blender Git Loki

* Added a release target to SConstruct -> 'scons release':
- after building blender and blenderplayer an archive is created in bin/ containing all necessary files
- you'll need now python2.3 or newer for SConstruct to go through correctly. This is not a problem,
since Blender requires python2.3 now anyway.
- the release target has been done for linux, win32 and os x, other platforms get a
warning message after blender has been built, just no package. See warning message for instructions
- for linux, osx and win32 the blenderplayer target has been enabled for default
- the build is logged to build.log for all platforms except win32. If you want it, you'll need tee.exe from
http://unxutils.sf.net in your path (I put it in C:\windows) and change the first if check in the
SConstruct accordingly