instruct users to use the stable branch
instruct users to use the stable branch

add information about switching branches


ajolma/perlweb,briandfoy/perlweb,Abigail/perlweb,autarch/perlweb,dagolden/perlweb,Abigail/perlweb,autarch/perlweb,bjakubski/perlweb,PeterMartini/perlweb,briandfoy/perlweb,ajolma/perlweb,Abigail/perlweb,bjakubski/perlweb,ajolma/perlweb,alcy/perlweb,autarch/perlweb,briandfoy/perlweb,dagolden/perlweb,alcy/perlweb,PeterMartini/perlweb,dagolden/perlweb,PeterMartini/perlweb,bjakubski/perlweb,alcy/perlweb