The GTest framework has a more active support base, and natively
supports CMake. Introduce it as an external dependency (using CMake's
ExternalProject_Add), replacing cppunit and porting the associated unit
tests.
Added factory provider for default log streams.
Added default log streams to std::out and std::cerr.
Updated VC8 project config, boost workarounds is now working for the viewer.
Updated unit test suite.
Fixed some minor issues in the postprocessing-framework.
BROKEN: DebugDLL build.
git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@292 67173fc5-114c-0410-ac8e-9d2fd5bffc1f