Updating the mget function in the C++ interface to take a std::vector of keys as input instead of an array of char *.
Updating the mget function in the C++ interface to take a std::vector of
keys as input instead of an array of char *.

trondn/libmemcached,trondn/libmemcached,trondn/libmemcached,trondn/libmemcached,trondn/libmemcached