improved error handling for corrupt files -> added warning
added windows dll export/import
UniformValue implementation changed from union to boost::variant<> for better readability and portability
windows port build system
Merge branch 'feature/new_renderer' of https://github.com/vrsys/guacamole into feature/new_renderer

Conflicts:
	include/gua/renderer/Uniform.hpp
	src/gua/renderer/Uniform.cpp
added dll-export
Merge pull request #89 from scholli/feature/new_renderer

Feature/new renderer