Updated C++ interface to have include guards. Also modified the naming convention for the functions in the C++ interface. We should use camel case for the C++ interface.
Updated C++ interface to have include guards. Also modified the naming
convention for the functions in the C++ interface. We should use camel case
for the C++ interface.

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