Remove out-of-sync sources comment.  Make source list clearer and sort it.
Remove out-of-sync sources comment.  Make source list clearer and sort it.

svn path=/trunk/libcss/; revision=13417

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