Fixed libxml2 parser default module name in cmake
FIX: With some hardware and drivers(mine) there is an OpenGL crash

This crash occurs on clearing a FBO with 0 height or width
Merge remote-tracking branch 'hg/master'
Fixed SampleFramework to work with OgreRenderer.
Corrected few typos/invalid structures of datafiles.
Corrected SampleMetaDatas.
Small fix to previous commit.
Fix case on windows.h and dbghelp.h

Fixes cross compiling on case sensitive filesystems.
Merged in pejus/cegui (pull request #3)

Fixed SampleFramework to work with OgreRenderer.
Fixed datafiles to validate against the .xsd schemas.
Merge remote-tracking branch 'hg/master'