Fix scons warnings for 'The env.Copy() method is deprecated; use the env.Clone()' and 'BuildDir() and the build_dir keyword have been deprecated;'
Upgrade to CSS level 3.0 (which should be the new development goal)
Updated prepare to CSS3.0
Added more properties that should be on CSS 3.0
Added support for non stardard CSS stuff and whether to discard them or allow them with --discard_nonstandard_properties=1 you get warnings (You need also --discard_invalid_properties=1 to really remove them)
User can choose now does he want to numbers to be optimized (--optimise_numbers=1 will be like old behaviour
src:url parsing and there can be duplicate elements (which can be turned on with --allow_duplicate_properties=1)