Fixed spelling issues in README and add option documentation
Fixed spelling issues in README and add option documentation

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