SERVER-10715: change MatchableDocument api to allow for caching of iterators
              this allows a 2x performance increase for scans
Remove unused message
SERVER-9518 Store delegatable roles list in User object in memory
SERVER-10715 Fix unit test compilation failure.
SERVER-9518 Hook up RoleGraph to AuthorizationManager and move all handling of built-in roles into it
Add MONGO_HASH_NAMESPACE macro for use in implementing std::hash<T>.
SERVER-4899 $size for aggregation
SERVER-10086 print typeName rather than type number on type error in $set operators
SERVER-9518 Move V0 system role constants into RoleGraph
SERVER-9518 Rename "system" roles to "built-in" roles
SERVER-10540 better error message now
SERVER-9109 continue rather than return on ECONNABORTED and EBADF