If feature is not on, install fails

[Webdesign29]

LEMPer/scripts/install_memcached.sh

Line 138 in d3f4ecd

 if [[ ${MEMCACHED_SASL} == "enable" || ${MEMCACHED_SASL} == true ]]; then 

LEMPer/scripts/install_memcached.sh

Line 179 in d3f4ecd

 run sed -i "s/-m 64/-m ${MEMCACHED_SIZE}/g" /etc/memcached_memcache.conf 

file "/etc/memcached_memcache.conf" does not exist but "/etc/memcached.conf~" exists

[Webdesign29]

needs something like this before sed

if [ ! -f /etc/memcached_memcache.conf ]; then
                run cp /etc/memcached.conf~ /etc/memcached_memcache.conf
            fi

[Edi Septriyanto]

pr #59 contains fix for this issue