Fix parsing of combinators: the CSS 2.1 spec grammar contains inaccuracies -- combinators may be preceded by whitespace. Fix handling of whitespace after a selector list: again, the CSS 2.1 grammar isn't accurate here.
Fix parsing of combinators: the CSS 2.1 spec grammar contains inaccuracies -- combinators may be preceded by whitespace.
Fix handling of whitespace after a selector list: again, the CSS 2.1 grammar isn't accurate here.

svn path=/trunk/libcss/; revision=5603

servo/libcss,zhuyadong/libcss,prepare/netsurf_libcss,servo/libcss,prepare/netsurf_libcss,servo/libcss,zhuyadong/libcss,prepare/netsurf_libcss,zhuyadong/libcss