update README
update Doxygen docs
scons option 'msvc' changed to 'mingw' as msvc is default
and mingw must be turned on explicitly
Bugs==== * Mingw + SSE does not workFuture Plans============ * Python binding for material.h classes * Container should implement Shape interface to allow building hierarchies * Container should allow local space transformations * generalization: Camera "shader" (ray generator), surface shader and maybe light & background shaders * put everything into a namespace * stochastic oversampling * absorbtion of refracted rays in dense materials (can be computed using shape distance and some 'absorbance' constant)