Bugs
====
 * Mingw + SSE does not work

Future Plans
============
 * UV texturing
 * PlanarMap should allow to choose normal axis
 * Container should implement Shape interface to allow building hierarchies
 * Container should allow local space transformations
 * stochastic oversampling
 * absorbtion of refracted rays in dense materials (can be computed using shape distance and some 'absorbance' constant)
 * put everything into a namespace