Update setup-debian.sh

Changes required for  installation of newer versions of mysql : 

table_open_cache = 32   #  ----- edited for newer versions of mysql, earlier it was table_cache
default-tmp-storage-engine=myisam  #  -----  added for newer versions of mysql
#log-slow-queries=/var/log/mysql/slow-queries.log  --- error in newer versions of mysql
Merge pull request #28 from suvdeep/patch-1

Update setup-debian.sh