Mac Build update build to 2013-09 versions

README.md
   reflect change in setenv_mac*.sh files
macosx-build-dependencies.sh
    qt4 version updated to 4.8.5 and is now at a different host which uses 302 redirection
FindBoost.cmake
    Added paths for MacPorts (/opt/local) and Brew (/usr/local) to previous Fink (/sw/local)
Merge pull request #471 from dmopalmer/mac_compile_2013.09

Mac Build update build to 2013-09 versions
Merge branch 'master' of github.com:openscad/openscad into svg2
add some svg files, cleaned up to work properly
update several svg files to work properly