Updated invalid test for binary files
Updated invalid test for binary files

The assertion was testing answer === answer instead
of checking the original message.

andrewbrereton/memcached,ronkorving/node-memcached,Starefossen/memcached,XadillaX/node-memcached,fouber/node-memcached,jolks/node-memcached,kbarbounakis/memcached,mgetz/memcached,mgetz/memcached,XadillaX/node-memcached,mrlannigan/memcached,jolks/node-memcached,acarrasco/node-memcached,kbarbounakis/memcached,andrewbrereton/memcached,mrlannigan/memcached,ronkorving/node-memcached,jkrems/memcached,3rd-Eden/node-memcached,3rd-Eden/node-memcached,fouber/node-memcached,mbrukman/node-memcache-client,3rd-Eden/memcached,3rd-Eden/memcached,Starefossen/memcached,acarrasco/node-memcached,jkrems/memcached,mbrukman/node-memcache-client