MSVC: add move-c'tor and move assignment by hand
MSVC: add move-c'tor and move assignment by hand

Related to [class.copy]/32. On IRC, Ville Voutilainen suggested that
this is a known (and old bug) but I failed to find a corresponding entry
on connect.microsoft.com

otris/ews-cpp,m-Schlitzer/ews-cpp,m-Schlitzer/ews-cpp,bkircher/ews-cpp,bkircher/ews-cpp,otris/ews-cpp,bkircher/ews-cpp,m-Schlitzer/ews-cpp,otris/ews-cpp,otris/ews-cpp